INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrelaized Gains(Losses) (Details) - USD ($)
|
Dec. 31, 2019 |
Dec. 31, 2018 |
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost |
$ 11,042,000,000
|
$ 11,027,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value |
11,125,000,000
|
10,754,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost |
1,594,000,000
|
1,838,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost |
1,196,000,000
|
1,057,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost |
231,000,000
|
186,000,000
|
| Debt Securities, Available-for-sale, Amortized Cost |
14,063,000,000
|
14,108,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
137,000,000
|
31,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(51,000,000)
|
(359,000,000)
|
| Debt Securities, Available-for-sale |
14,149,000,000
|
13,780,000,000
|
| Debt Securities, Held-to-maturity |
9,070,000,000
|
8,565,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
119,000,000
|
2,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(3,000,000)
|
(281,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
9,186,000,000
|
8,286,000,000
|
| Equity Securities, FV-NI, Cost |
441,000,000
|
564,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax |
0
|
1,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
441,000,000
|
565,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value |
229,000,000
|
185,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value |
1,189,000,000
|
1,039,000,000
|
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value |
1,606,000,000
|
1,802,000,000
|
| U.S. Treasury securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
10,000,000
|
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 |
10,000,000
|
5,000,000
|
| Collateralized Mortgage Obligations [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
5,055,000,000
|
7,185,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
48,000,000
|
15,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(18,000,000)
|
(201,000,000)
|
| Debt Securities, Available-for-sale |
5,085,000,000
|
6,999,000,000
|
| Debt Securities, Held-to-maturity |
2,351,000,000
|
2,124,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
33,000,000
|
0
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(3,000,000)
|
(47,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
2,381,000,000
|
2,077,000,000
|
| Residential Mortgage Backed Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
4,180,000,000
|
1,261,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
45,000,000
|
9,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(3,000,000)
|
(15,000,000)
|
| Debt Securities, Available-for-sale |
4,222,000,000
|
1,255,000,000
|
| Debt Securities, Held-to-maturity |
2,463,000,000
|
1,851,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
50,000,000
|
2,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
0
|
(42,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
2,513,000,000
|
1,811,000,000
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
979,000,000
|
1,641,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
1,000,000
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(4,000,000)
|
(58,000,000)
|
| Debt Securities, Available-for-sale |
976,000,000
|
1,583,000,000
|
| Debt Securities, Held-to-maturity |
3,959,000,000
|
4,235,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
34,000,000
|
0
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
0
|
(186,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
3,993,000,000
|
4,049,000,000
|
| Other Federal Agencies [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
165,000,000
|
128,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
1,000,000
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(1,000,000)
|
(2,000,000)
|
| Debt Securities, Available-for-sale |
165,000,000
|
126,000,000
|
| Debt Securities, Held-to-maturity |
293,000,000
|
350,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
2,000,000
|
0
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
0
|
(6,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
295,000,000
|
344,000,000
|
| US Government-sponsored Enterprises Debt Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
10,389,000,000
|
10,220,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
95,000,000
|
24,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(26,000,000)
|
(276,000,000)
|
| Debt Securities, Available-for-sale |
10,458,000,000
|
9,968,000,000
|
| Debt Securities, Held-to-maturity |
9,066,000,000
|
8,560,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |
119,000,000
|
2,000,000
|
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |
(3,000,000)
|
(281,000,000)
|
| Debt Securities, Held-to-maturity, Fair Value |
9,182,000,000
|
8,281,000,000
|
| Municipal securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
3,044,000,000
|
3,512,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
34,000,000
|
6,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(23,000,000)
|
(78,000,000)
|
| Debt Securities, Available-for-sale |
3,055,000,000
|
3,440,000,000
|
| Debt Securities, Held-to-maturity |
4,000,000
|
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 |
4,000,000
|
5,000,000
|
| Mortgage-backed Securities, Issued by Private Enterprises [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
2,000,000
|
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
0
|
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
|
| Debt Securities, Available-for-sale |
2,000,000
|
|
| Asset-backed securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
575,000,000
|
318,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
6,000,000
|
1,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
(2,000,000)
|
(4,000,000)
|
| Debt Securities, Available-for-sale |
579,000,000
|
315,000,000
|
| Corporate debt |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
49,000,000
|
54,000,000
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |
2,000,000
|
0
|
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |
0
|
(1,000,000)
|
| Debt Securities, Available-for-sale |
51,000,000
|
53,000,000
|
| Other Securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Debt Securities, Available-for-sale, Amortized Cost |
4,000,000
|
4,000,000
|
| 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
|
4,000,000
|
| Mutual Fund [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
53,000,000
|
20,000,000
|
| 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 |
53,000,000
|
20,000,000
|
| 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 |
0
|
1,000,000
|
| Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax |
0
|
0
|
| Equity Securities, FV-NI |
1,000,000
|
2,000,000
|
| 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 |
90,000,000
|
248,000,000
|
| 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 |
90,000,000
|
248,000,000
|
| Investment in Federal Reserve Stock [Member] | Nonmarketable Equity Securities [Member] |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Equity Securities, FV-NI, Cost |
297,000,000
|
295,000,000
|
| 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 |
$ 297,000,000
|
$ 295,000,000
|