INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Sep. 30, 2024 |
Dec. 31, 2023 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 31,199
|
$ 28,565
|
| Available-for-sale securities, Gross Gains |
95
|
85
|
| Available-for-sale securities, Gross Losses |
(2,802)
|
(3,345)
|
| Available-for-sale securities, Fair Value |
28,492
|
25,305
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,670
|
15,750
|
| Held-to-maturity securities, Gross Gains |
14
|
7
|
| Held-to-maturity securities, Gross Losses |
(1,751)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
13,933
|
13,718
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
826
|
724
|
| Other securities, Gross Gains |
0
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
826
|
725
|
| Accrued interest receivable on AFS securities |
88
|
61
|
| Accrued interest receivable on HTM securities |
38
|
36
|
| Cumulative basis adjustments associated with hedging relationships |
377
|
619
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
6,508
|
2,855
|
| Available-for-sale securities, Gross Gains |
24
|
1
|
| Available-for-sale securities, Gross Losses |
(2)
|
0
|
| Available-for-sale securities, Fair Value |
6,530
|
2,856
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
996
|
|
| Held-to-maturity securities, Gross Gains |
2
|
|
| Held-to-maturity securities, Gross Losses |
(1)
|
|
| Held-to-maturity securities, Fair Value |
997
|
|
| US Treasury and Government |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
24,809
|
22,299
|
| Available-for-sale securities, Gross Gains |
29
|
4
|
| Available-for-sale securities, Gross Losses |
(2,495)
|
(2,899)
|
| Available-for-sale securities, Fair Value |
22,343
|
19,404
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,668
|
15,748
|
| Held-to-maturity securities, Gross Gains |
14
|
7
|
| Held-to-maturity securities, Gross Losses |
(1,750)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
13,932
|
13,716
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,363
|
3,592
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(341)
|
(408)
|
| Available-for-sale securities, Fair Value |
3,022
|
3,184
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,429
|
4,770
|
| Held-to-maturity securities, Gross Gains |
11
|
6
|
| Held-to-maturity securities, Gross Losses |
(570)
|
(664)
|
| Held-to-maturity securities, Fair Value |
3,870
|
4,112
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
12,277
|
13,155
|
| Available-for-sale securities, Gross Gains |
5
|
3
|
| Available-for-sale securities, Gross Losses |
(1,497)
|
(1,776)
|
| Available-for-sale securities, Fair Value |
10,785
|
11,382
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
8,735
|
9,368
|
| Held-to-maturity securities, Gross Gains |
1
|
1
|
| Held-to-maturity securities, Gross Losses |
(983)
|
(1,145)
|
| Held-to-maturity securities, Fair Value |
7,753
|
8,224
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,521
|
2,536
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(651)
|
(709)
|
| Available-for-sale securities, Fair Value |
1,870
|
1,827
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,428
|
1,509
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(192)
|
(224)
|
| Held-to-maturity securities, Fair Value |
1,236
|
1,285
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
140
|
161
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(4)
|
(6)
|
| Available-for-sale securities, Fair Value |
136
|
155
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
80
|
101
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(4)
|
(6)
|
| Held-to-maturity securities, Fair Value |
76
|
95
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,756
|
3,536
|
| Available-for-sale securities, Gross Gains |
4
|
2
|
| Available-for-sale securities, Gross Losses |
(112)
|
(165)
|
| Available-for-sale securities, Fair Value |
3,648
|
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 |
(1)
|
0
|
| Held-to-maturity securities, Fair Value |
1
|
2
|
| Private-label CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
122
|
131
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(8)
|
(12)
|
| Available-for-sale securities, Fair Value |
114
|
119
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
323
|
387
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(17)
|
(31)
|
| Available-for-sale securities, Fair Value |
306
|
356
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,179
|
2,202
|
| Available-for-sale securities, Gross Gains |
62
|
79
|
| Available-for-sale securities, Gross Losses |
(170)
|
(238)
|
| Available-for-sale securities, Fair Value |
2,071
|
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, Fair Value |
10
|
10
|
| Other non-marketable equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
25
|
17
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
25
|
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
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
249
|
169
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
249
|
169
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
520
|
507
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 520
|
$ 507
|