INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrelaized Gains(Losses) (Details) - USD ($)
|
Dec. 31, 2018 |
Dec. 31, 2017 |
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
$ 14,108,000,000
|
$ 15,127,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
31,000,000
|
28,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(359,000,000)
|
(286,000,000)
|
| Debt Securities, Available-for-sale |
13,780,000,000
|
14,869,000,000
|
| Debt Securities, Held-to-maturity |
8,565,000,000
|
9,091,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
2,000,000
|
4,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(281,000,000)
|
(124,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
8,286,000,000
|
8,971,000,000
|
| Equity Securities, FV-NI, Cost |
564,000,000
|
600,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
1
|
0
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
565,000,000
|
600,000,000
|
| U.S. Treasury securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
5,000,000
|
5,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale |
5,000,000
|
5,000,000
|
| Collateralized Mortgage Obligations [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
7,185,000,000
|
6,661,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
15,000,000
|
1,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(201,000,000)
|
(178,000,000)
|
| Debt Securities, Available-for-sale |
6,999,000,000
|
6,484,000,000
|
| Debt Securities, Held-to-maturity |
2,124,000,000
|
3,714,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
0
|
1,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(47,000,000)
|
(58,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
2,077,000,000
|
3,657,000,000
|
| Residential Mortgage Backed Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
1,261,000,000
|
1,371,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
9,000,000
|
1,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(15,000,000)
|
(5,000,000)
|
| Debt Securities, Available-for-sale |
1,255,000,000
|
1,367,000,000
|
| Debt Securities, Held-to-maturity |
1,851,000,000
|
1,049,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
2,000,000
|
2,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(42,000,000)
|
(7,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
1,811,000,000
|
1,044,000,000
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
1,641,000,000
|
2,539,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(58,000,000)
|
(52,000,000)
|
| Debt Securities, Available-for-sale |
1,583,000,000
|
2,487,000,000
|
| Debt Securities, Held-to-maturity |
4,235,000,000
|
3,791,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
0
|
0
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(186,000,000)
|
(55,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
4,049,000,000
|
3,736,000,000
|
| Other Federal Agencies [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
128,000,000
|
69,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
1,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(2,000,000)
|
0
|
| Debt Securities, Available-for-sale |
126,000,000
|
70,000,000
|
| Debt Securities, Held-to-maturity |
350,000,000
|
532,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
0
|
1,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(6,000,000)
|
(4,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
344,000,000
|
529,000,000
|
| US Government-sponsored Enterprises Debt Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
10,220,000,000
|
10,645,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
24,000,000
|
3,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(276,000,000)
|
(235,000,000)
|
| Debt Securities, Available-for-sale |
9,968,000,000
|
10,413,000,000
|
| Debt Securities, Held-to-maturity |
8,560,000,000
|
9,086,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
2,000,000
|
4,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(281,000,000)
|
(124,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
8,281,000,000
|
8,966,000,000
|
| Municipal securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
3,512,000,000
|
3,892,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
6,000,000
|
21,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(78,000,000)
|
(35,000,000)
|
| Debt Securities, Available-for-sale |
3,440,000,000
|
3,878,000,000
|
| Debt Securities, Held-to-maturity |
5,000,000
|
5,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
0
|
0
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
0
|
0
|
| Debt Securities, Held-to-maturity, Fair Value |
5,000,000
|
5,000,000
|
| Asset-backed securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
318,000,000
|
482,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
1,000,000
|
1,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(4,000,000)
|
(16,000,000)
|
| Debt Securities, Available-for-sale |
315,000,000
|
467,000,000
|
| Corporate debt |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
54,000,000
|
106,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
3,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(1,000,000)
|
0
|
| Debt Securities, Available-for-sale |
53,000,000
|
109,000,000
|
| Other Securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
4,000,000
|
2,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Debt Securities, Available-for-sale |
4,000,000
|
2,000,000
|
| Mutual Fund [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
20,000,000
|
18,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
20,000,000
|
18,000,000
|
| Equity Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
1,000,000
|
1,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
1
|
0
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
2,000,000
|
1,000,000
|
| Investment in Federal Home Loan Bank Stock [Member] | Nonmarketable Equity Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
248,000,000
|
287,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
248,000,000
|
287,000,000
|
| Investment in Federal Reserve Stock [Member] | Nonmarketable Equity Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
295,000,000
|
294,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
0
|
0
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
$ 295,000,000
|
$ 294,000,000
|