INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Mar. 31, 2024 |
Dec. 31, 2023 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 30,294
|
$ 28,565
|
| Available-for-sale securities, Gross Gains |
104
|
85
|
| Available-for-sale securities, Gross Losses |
(3,597)
|
(3,345)
|
| Available-for-sale securities |
26,801
|
25,305
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,416
|
15,750
|
| Held-to-maturity securities, Gross Gains |
1
|
7
|
| Held-to-maturity securities, Gross Losses |
(2,246)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
13,171
|
13,718
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
727
|
724
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
727
|
725
|
| Cumulative basis adjustments associated with hedging relationships |
680
|
619
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
5,027
|
2,855
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities |
5,027
|
2,856
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,519
|
3,592
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(444)
|
(408)
|
| Available-for-sale securities |
3,075
|
3,184
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,664
|
4,770
|
| Held-to-maturity securities, Gross Gains |
1
|
6
|
| Held-to-maturity securities, Gross Losses |
(706)
|
(664)
|
| Held-to-maturity securities, Fair Value |
3,959
|
4,112
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
12,893
|
13,155
|
| Available-for-sale securities, Gross Gains |
1
|
3
|
| Available-for-sale securities, Gross Losses |
(1,964)
|
(1,776)
|
| Available-for-sale securities |
10,930
|
11,382
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
9,175
|
9,368
|
| Held-to-maturity securities, Gross Gains |
0
|
1
|
| Held-to-maturity securities, Gross Losses |
(1,301)
|
(1,145)
|
| Held-to-maturity securities, Fair Value |
7,874
|
8,224
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,530
|
2,536
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(735)
|
(709)
|
| Available-for-sale securities |
1,795
|
1,827
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,482
|
1,509
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(232)
|
(224)
|
| Held-to-maturity securities, Fair Value |
1,250
|
1,285
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
154
|
161
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(7)
|
(6)
|
| Available-for-sale securities |
147
|
155
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
93
|
101
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(7)
|
(6)
|
| Held-to-maturity securities, Fair Value |
86
|
95
|
| Total U.S. Treasury, federal agency, and other agency securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
24,123
|
22,299
|
| Available-for-sale securities, Gross Gains |
1
|
4
|
| Available-for-sale securities, Gross Losses |
(3,150)
|
(2,899)
|
| Available-for-sale securities |
20,974
|
19,404
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,414
|
15,748
|
| Held-to-maturity securities, Gross Gains |
1
|
7
|
| Held-to-maturity securities, Gross Losses |
(2,246)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
13,169
|
13,716
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,475
|
3,536
|
| Available-for-sale securities, Gross Gains |
13
|
2
|
| Available-for-sale securities, Gross Losses |
(157)
|
(165)
|
| Available-for-sale securities |
3,331
|
3,373
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
2
|
2
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
0
|
0
|
| Held-to-maturity securities, Fair Value |
2
|
2
|
| Private-label CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
128
|
131
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
(12)
|
(12)
|
| Available-for-sale securities |
117
|
119
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
379
|
387
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(28)
|
(31)
|
| Available-for-sale securities |
351
|
356
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,179
|
2,202
|
| Available-for-sale securities, Gross Gains |
89
|
79
|
| Available-for-sale securities, Gross Losses |
(250)
|
(238)
|
| Available-for-sale securities |
2,018
|
2,043
|
| 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
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
18
|
17
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
18
|
17
|
| Mutual funds |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
31
|
30
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
31
|
30
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
1
|
1
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
1
|
2
|
| Debt Securities, Available-For-Sale Securities |
|
|
| Other securities, at cost: |
|
|
| Accrued interest receivable |
72
|
61
|
| Debt Securities, Held-To-Maturity Securities |
|
|
| Other securities, at cost: |
|
|
| Accrued interest receivable |
35
|
36
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
159
|
169
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
159
|
169
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
518
|
507
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 518
|
$ 507
|