INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 31,081
|
$ 30,743
|
| Available-for-sale securities, Gross Gains |
44
|
13
|
| Available-for-sale securities, Gross Losses |
(2,795)
|
(3,483)
|
| Available-for-sale securities |
28,330
|
27,273
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,965
|
16,368
|
| Held-to-maturity securities, Gross Gains |
24
|
3
|
| Held-to-maturity securities, Gross Losses |
(1,900)
|
(2,285)
|
| Held-to-maturity securities, Fair Value |
14,089
|
14,086
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
878
|
822
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
878
|
823
|
| Accrued interest receivable on AFS securities |
82
|
89
|
| Accrued interest receivable on HTM securities |
46
|
46
|
| Cumulative basis adjustments associated with hedging relationships |
197
|
458
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
7,351
|
6,588
|
| Available-for-sale securities, Gross Gains |
39
|
11
|
| Available-for-sale securities, Gross Losses |
(6)
|
(43)
|
| Available-for-sale securities |
7,384
|
6,556
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
2,330
|
2,045
|
| Held-to-maturity securities, Gross Gains |
14
|
0
|
| Held-to-maturity securities, Gross Losses |
(3)
|
(22)
|
| Held-to-maturity securities, Fair Value |
2,341
|
2,023
|
| US Treasury and Government |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
26,283
|
25,008
|
| Available-for-sale securities, Gross Gains |
41
|
12
|
| Available-for-sale securities, Gross Losses |
(2,640)
|
(3,220)
|
| Available-for-sale securities |
23,684
|
21,800
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,964
|
16,367
|
| Held-to-maturity securities, Gross Gains |
24
|
3
|
| Held-to-maturity securities, Gross Losses |
(1,900)
|
(2,285)
|
| Held-to-maturity securities, Fair Value |
14,088
|
14,085
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
11,436
|
11,988
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
(1,596)
|
(1,971)
|
| Available-for-sale securities |
9,841
|
10,017
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
8,127
|
8,533
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(1,111)
|
(1,336)
|
| Held-to-maturity securities, Fair Value |
7,016
|
7,197
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
4,922
|
3,778
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
(354)
|
(434)
|
| Available-for-sale securities |
4,568
|
3,345
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,088
|
4,309
|
| Held-to-maturity securities, Gross Gains |
10
|
3
|
| Held-to-maturity securities, Gross Losses |
(577)
|
(691)
|
| Held-to-maturity securities, Fair Value |
3,521
|
3,621
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,453
|
2,519
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
(680)
|
(767)
|
| Available-for-sale securities |
1,774
|
1,752
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,358
|
1,407
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(206)
|
(231)
|
| Held-to-maturity securities, Fair Value |
1,152
|
1,176
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
121
|
135
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(4)
|
(5)
|
| Available-for-sale securities |
117
|
130
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
61
|
73
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(3)
|
(5)
|
| Held-to-maturity securities, Fair Value |
58
|
68
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
4,205
|
4,119
|
| Available-for-sale securities, Gross Gains |
3
|
1
|
| Available-for-sale securities, Gross Losses |
(116)
|
(132)
|
| Available-for-sale securities |
4,092
|
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 |
191
|
119
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(19)
|
(10)
|
| Available-for-sale securities |
172
|
109
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
279
|
330
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(12)
|
(19)
|
| Available-for-sale securities |
267
|
311
|
| Private-label CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
113
|
1,157
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(8)
|
(102)
|
| Available-for-sale securities |
105
|
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 |
575
|
521
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
575
|
521
|
| Non-marketable equity securities: | FHLB stock |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
248
|
246
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
248
|
246
|
| Other non-marketable equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
24
|
25
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
24
|
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
|