INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 30,857
|
$ 30,743
|
| Available-for-sale securities, Gross Gains |
32
|
13
|
| Available-for-sale securities, Gross Losses |
(3,050)
|
(3,483)
|
| Available-for-sale securities |
27,839
|
27,273
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,315
|
16,368
|
| Held-to-maturity securities, Gross Gains |
16
|
3
|
| Held-to-maturity securities, Gross Losses |
(1,987)
|
(2,285)
|
| Held-to-maturity securities, Fair Value |
14,344
|
14,086
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
880
|
822
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
880
|
823
|
| Accrued interest receivable on AFS securities |
99
|
89
|
| Accrued interest receivable on HTM securities |
43
|
46
|
| Cumulative basis adjustments associated with hedging relationships |
336
|
458
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
6,625
|
6,588
|
| Available-for-sale securities, Gross Gains |
28
|
11
|
| Available-for-sale securities, Gross Losses |
(14)
|
(43)
|
| Available-for-sale securities |
6,639
|
6,556
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
2,320
|
2,045
|
| Held-to-maturity securities, Gross Gains |
8
|
0
|
| Held-to-maturity securities, Gross Losses |
(7)
|
(22)
|
| Held-to-maturity securities, Fair Value |
2,321
|
2,023
|
| US Treasury and Government |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
25,191
|
25,008
|
| Available-for-sale securities, Gross Gains |
31
|
12
|
| Available-for-sale securities, Gross Losses |
(2,814)
|
(3,220)
|
| Available-for-sale securities |
22,408
|
21,800
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,314
|
16,367
|
| Held-to-maturity securities, Gross Gains |
16
|
3
|
| Held-to-maturity securities, Gross Losses |
(1,987)
|
(2,285)
|
| Held-to-maturity securities, Fair Value |
14,343
|
14,085
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
11,727
|
11,988
|
| Available-for-sale securities, Gross Gains |
2
|
0
|
| Available-for-sale securities, Gross Losses |
(1,700)
|
(1,971)
|
| Available-for-sale securities |
10,029
|
10,017
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
8,338
|
8,533
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(1,156)
|
(1,336)
|
| Held-to-maturity securities, Fair Value |
7,182
|
7,197
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
4,198
|
3,778
|
| Available-for-sale securities, Gross Gains |
1
|
1
|
| Available-for-sale securities, Gross Losses |
(377)
|
(434)
|
| Available-for-sale securities |
3,822
|
3,345
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,201
|
4,309
|
| Held-to-maturity securities, Gross Gains |
8
|
3
|
| Held-to-maturity securities, Gross Losses |
(610)
|
(691)
|
| Held-to-maturity securities, Fair Value |
3,599
|
3,621
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,514
|
2,519
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(719)
|
(767)
|
| Available-for-sale securities |
1,795
|
1,752
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,388
|
1,407
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(211)
|
(231)
|
| Held-to-maturity securities, Fair Value |
1,177
|
1,176
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
127
|
135
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(4)
|
(5)
|
| Available-for-sale securities |
123
|
130
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
67
|
73
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(3)
|
(5)
|
| Held-to-maturity securities, Fair Value |
64
|
68
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
4,088
|
4,119
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
(126)
|
(132)
|
| Available-for-sale securities |
3,962
|
3,988
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1
|
1
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
0
|
0
|
| Held-to-maturity securities, Fair Value |
1
|
1
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
1,138
|
119
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(86)
|
(10)
|
| Available-for-sale securities |
1,052
|
109
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
313
|
330
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(15)
|
(19)
|
| Available-for-sale securities |
298
|
311
|
| Private-label CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
117
|
1,157
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
(9)
|
(102)
|
| Available-for-sale securities |
109
|
1,055
|
| Other securities/sovereign debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
10
|
10
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities |
10
|
10
|
| Non-marketable equity securities: | FRB stock |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
574
|
521
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
574
|
521
|
| Non-marketable equity securities: | FHLB stock |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
252
|
246
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
252
|
246
|
| Other non-marketable equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
23
|
25
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
23
|
25
|
| Mutual funds |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
29
|
29
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
29
|
29
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
2
|
1
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 2
|
$ 2
|