AVAILABLE-FOR-SALE SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Millions |
Sep. 30, 2018 |
Dec. 31, 2017 |
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
$ 5,085
|
$ 5,545
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
148
|
61
|
| Over 12 Months |
7,792
|
6,728
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
416
|
225
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
12,877
|
12,273
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(564)
|
(286)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost |
14,279
|
15,127
|
| Unrealized Gross Gains |
12
|
28
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(564)
|
(286)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Available-for-sale securities |
13,727
|
14,869
|
| U.S. Treasury |
|
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, Under 1 year |
5
|
5
|
| Amortized Cost |
5
|
5
|
| Unrealized Gross Gains |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, Under 1 year |
5
|
5
|
| Available-for-sale securities |
5
|
5
|
| Collateralized Mortgage Obligations [Member] |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
2,286
|
1,660
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
77
|
19
|
| Over 12 Months |
4,632
|
4,520
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
290
|
159
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
6,918
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(367)
|
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, 1-5 years |
0
|
1
|
| Amortized Cost, 6-10 years |
41
|
90
|
| Amortized Cost, Over 10 years |
7,266
|
6,570
|
| Amortized Cost |
7,307
|
6,661
|
| Unrealized Gross Gains |
0
|
1
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(367)
|
(178)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, 1-5 years |
0
|
1
|
| Fair Value, 6-10 years |
40
|
89
|
| Fair Value, Over 10 years |
6,900
|
6,394
|
| Available-for-sale securities |
6,940
|
6,484
|
| Residential Mortgage Backed Securities [Member] |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
542
|
1,078
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
23
|
5
|
| Over 12 Months |
70
|
11
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
3
|
0
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
612
|
1,089
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(26)
|
(5)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, 1-5 years |
3
|
6
|
| Amortized Cost, 6-10 years |
30
|
7
|
| Amortized Cost, Over 10 years |
613
|
1,358
|
| Amortized Cost |
646
|
1,371
|
| Unrealized Gross Gains |
0
|
1
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(26)
|
(5)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, 1-5 years |
3
|
6
|
| Fair Value, 6-10 years |
29
|
8
|
| Fair Value, Over 10 years |
588
|
1,353
|
| Available-for-sale securities |
620
|
1,367
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
109
|
960
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
4
|
15
|
| Over 12 Months |
1,594
|
1,527
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
76
|
37
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
1,703
|
2,487
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(80)
|
(52)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, 1-5 years |
68
|
23
|
| Amortized Cost, 6-10 years |
8
|
151
|
| Amortized Cost, Over 10 years |
1,707
|
2,365
|
| Amortized Cost |
1,783
|
2,539
|
| Unrealized Gross Gains |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(80)
|
(52)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, 1-5 years |
65
|
22
|
| Fair Value, 6-10 years |
8
|
148
|
| Fair Value, Over 10 years |
1,630
|
2,317
|
| Available-for-sale securities |
1,703
|
2,487
|
| Federal agencies: Mortgage-backed securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
|
6,180
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
|
(178)
|
| Federal agencies, Other agencies |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
80
|
39
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
2
|
0
|
| Over 12 Months |
72
|
0
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
3
|
0
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
152
|
39
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(5)
|
0
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, Under 1 year |
1
|
2
|
| Amortized Cost, 1-5 years |
10
|
9
|
| Amortized Cost, 6-10 years |
151
|
58
|
| Amortized Cost |
162
|
69
|
| Unrealized Gross Gains |
0
|
1
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(5)
|
0
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, Under 1 year |
1
|
2
|
| Fair Value, 1-5 years |
10
|
9
|
| Fair Value, 6-10 years |
146
|
59
|
| Available-for-sale securities |
157
|
70
|
| Total U.S. Treasury, Federal agency and other agency securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
3,017
|
3,737
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
106
|
39
|
| Over 12 Months |
6,368
|
6,058
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
372
|
196
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
9,385
|
9,795
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(478)
|
(235)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost |
9,903
|
10,645
|
| Unrealized Gross Gains |
0
|
3
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(478)
|
(235)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Available-for-sale securities |
9,425
|
10,413
|
| Municipal securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
1,846
|
1,681
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
39
|
21
|
| Over 12 Months |
1,278
|
497
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
38
|
14
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
3,124
|
2,178
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(77)
|
(35)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, Under 1 year |
211
|
103
|
| Amortized Cost, 1-5 years |
1,156
|
1,140
|
| Amortized Cost, 6-10 years |
1,714
|
1,709
|
| Amortized Cost, Over 10 years |
833
|
940
|
| Amortized Cost |
3,914
|
3,892
|
| Unrealized Gross Gains |
11
|
21
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(77)
|
(35)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, Under 1 year |
208
|
103
|
| Fair Value, 1-5 years |
1,143
|
1,134
|
| Fair Value, 6-10 years |
1,686
|
1,704
|
| Fair Value, Over 10 years |
811
|
937
|
| Available-for-sale securities |
3,848
|
3,878
|
| Asset-backed securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
157
|
127
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
3
|
1
|
| Over 12 Months |
146
|
173
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
6
|
15
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
303
|
300
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
(9)
|
(16)
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, 1-5 years |
40
|
80
|
| Amortized Cost, 6-10 years |
41
|
53
|
| Amortized Cost, Over 10 years |
291
|
349
|
| Amortized Cost |
372
|
482
|
| Unrealized Gross Gains |
0
|
1
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(9)
|
(16)
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, 1-5 years |
39
|
80
|
| Fair Value, 6-10 years |
41
|
54
|
| Fair Value, Over 10 years |
283
|
333
|
| Available-for-sale securities |
363
|
467
|
| Corporate debt |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
65
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
|
| Over 12 Months |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
65
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
0
|
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, Under 1 year |
1
|
0
|
| Amortized Cost, 1-5 years |
74
|
73
|
| Amortized Cost, 6-10 years |
11
|
20
|
| Amortized Cost, Over 10 years |
0
|
13
|
| Amortized Cost |
86
|
106
|
| Unrealized Gross Gains |
1
|
3
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, Under 1 year |
1
|
0
|
| Fair Value, 1-5 years |
74
|
74
|
| Fair Value, 6-10 years |
12
|
21
|
| Fair Value, Over 10 years |
0
|
14
|
| Available-for-sale securities |
87
|
109
|
| Other securities/Sovereign debt |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Less than 12 Months |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
|
| Over 12 Months |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |
0
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |
0
|
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |
|
|
| Amortized Cost, Under 1 year |
0
|
1
|
| Amortized Cost, 1-5 years |
4
|
1
|
| Amortized Cost |
4
|
2
|
| Unrealized Gross Gains |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Fair Value, Under 1 year |
0
|
1
|
| Fair Value, 1-5 years |
4
|
1
|
| Available-for-sale securities |
$ 4
|
$ 2
|