INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 31,001
|
$ 28,565
|
| Available-for-sale securities, Gross Gains |
92
|
85
|
| Available-for-sale securities, Gross Losses |
(3,639)
|
(3,345)
|
| Available-for-sale securities |
27,454
|
25,305
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,036
|
15,750
|
| Held-to-maturity securities, Gross Gains |
1
|
7
|
| Held-to-maturity securities, Gross Losses |
(2,307)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
12,730
|
13,718
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
843
|
724
|
| Other securities, Gross Gains |
1
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
844
|
725
|
| Accrued interest receivable on AFS securities |
72
|
61
|
| Accrued interest receivable on HTM securities |
34
|
36
|
| Cumulative basis adjustments associated with hedging relationships |
642
|
619
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
6,112
|
2,855
|
| Available-for-sale securities, Gross Gains |
1
|
1
|
| Available-for-sale securities, Gross Losses |
(2)
|
0
|
| Available-for-sale securities |
6,111
|
2,856
|
| Total U.S. Treasury, federal agency, and other agency securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
24,812
|
22,299
|
| Available-for-sale securities, Gross Gains |
2
|
4
|
| Available-for-sale securities, Gross Losses |
(3,176)
|
(2,899)
|
| Available-for-sale securities |
21,638
|
19,404
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
15,035
|
15,748
|
| Held-to-maturity securities, Gross Gains |
1
|
7
|
| Held-to-maturity securities, Gross Losses |
(2,307)
|
(2,039)
|
| Held-to-maturity securities, Fair Value |
12,729
|
13,716
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,440
|
3,592
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(448)
|
(408)
|
| Available-for-sale securities |
2,992
|
3,184
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,542
|
4,770
|
| Held-to-maturity securities, Gross Gains |
1
|
6
|
| Held-to-maturity securities, Gross Losses |
(714)
|
(664)
|
| Held-to-maturity securities, Fair Value |
3,829
|
4,112
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
12,586
|
13,155
|
| Available-for-sale securities, Gross Gains |
1
|
3
|
| Available-for-sale securities, Gross Losses |
(1,972)
|
(1,776)
|
| Available-for-sale securities |
10,615
|
11,382
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
8,956
|
9,368
|
| Held-to-maturity securities, Gross Gains |
0
|
1
|
| Held-to-maturity securities, Gross Losses |
(1,345)
|
(1,145)
|
| Held-to-maturity securities, Fair Value |
7,611
|
8,224
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,525
|
2,536
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(747)
|
(709)
|
| Available-for-sale securities |
1,778
|
1,827
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,450
|
1,509
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(242)
|
(224)
|
| Held-to-maturity securities, Fair Value |
1,208
|
1,285
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
149
|
161
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(7)
|
(6)
|
| Available-for-sale securities |
142
|
155
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
87
|
101
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(6)
|
(6)
|
| Held-to-maturity securities, Fair Value |
81
|
95
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,556
|
3,536
|
| Available-for-sale securities, Gross Gains |
0
|
2
|
| Available-for-sale securities, Gross Losses |
(178)
|
(165)
|
| Available-for-sale securities |
3,378
|
3,373
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1
|
2
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
0
|
0
|
| Held-to-maturity securities, Fair Value |
1
|
2
|
| Private-label CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
124
|
131
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(12)
|
(12)
|
| Available-for-sale securities |
112
|
119
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
332
|
387
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(26)
|
(31)
|
| Available-for-sale securities |
306
|
356
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,167
|
2,202
|
| Available-for-sale securities, Gross Gains |
90
|
79
|
| Available-for-sale securities, Gross Losses |
(247)
|
(238)
|
| Available-for-sale securities |
2,010
|
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 |
17
|
17
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
17
|
17
|
| Mutual funds |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
30
|
30
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
30
|
30
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
1
|
1
|
| Other securities, Gross Gains |
1
|
1
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
2
|
2
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
276
|
169
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
276
|
169
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
519
|
507
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 519
|
$ 507
|