INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
$ 28,565
|
$ 27,103
|
| Available-for-sale securities, Gross Gains |
85
|
138
|
| Available-for-sale securities, Gross Losses |
(3,345)
|
(3,818)
|
| Available-for-sale securities, Fair Value |
25,305
|
23,423
|
| Held-to-maturity securities, Amortized Cost |
15,750
|
17,052
|
| Held-to-maturity securities, Gross Gains |
7
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,039)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
13,718
|
14,754
|
| Other securities, Amortized Cost |
724
|
854
|
| Other securities, Gross Gains |
1
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
725
|
854
|
| Hedged asset, fair value hedge, last-of-layer, cumulative increase (decrease) |
619
|
849
|
| U.S. Treasury securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
2,855
|
103
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities, Fair Value |
2,856
|
103
|
| Residential CMO |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
3,592
|
3,336
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(408)
|
(422)
|
| Available-for-sale securities, Fair Value |
3,184
|
2,914
|
| Held-to-maturity securities, Amortized Cost |
4,770
|
4,970
|
| Held-to-maturity securities, Gross Gains |
6
|
4
|
| Held-to-maturity securities, Gross Losses |
(664)
|
(714)
|
| Held-to-maturity securities, Fair Value |
4,112
|
4,260
|
| Residential MBS |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
13,155
|
14,349
|
| Available-for-sale securities, Gross Gains |
3
|
4
|
| Available-for-sale securities, Gross Losses |
(1,776)
|
(2,090)
|
| Available-for-sale securities, Fair Value |
11,382
|
12,263
|
| Held-to-maturity securities, Amortized Cost |
9,368
|
10,295
|
| Held-to-maturity securities, Gross Gains |
1
|
0
|
| Held-to-maturity securities, Gross Losses |
(1,145)
|
(1,375)
|
| Held-to-maturity securities, Fair Value |
8,224
|
8,920
|
| Commercial MBS |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
2,536
|
2,565
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(709)
|
(612)
|
| Available-for-sale securities, Fair Value |
1,827
|
1,953
|
| Held-to-maturity securities, Amortized Cost |
1,509
|
1,652
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(224)
|
(204)
|
| Held-to-maturity securities, Fair Value |
1,285
|
1,448
|
| Other agencies |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
161
|
190
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
(6)
|
(9)
|
| Available-for-sale securities, Fair Value |
155
|
182
|
| Held-to-maturity securities, Amortized Cost |
101
|
133
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(6)
|
(9)
|
| Held-to-maturity securities, Fair Value |
95
|
124
|
| Total U.S. Treasury, federal agency, and other agency securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
22,299
|
20,543
|
| Available-for-sale securities, Gross Gains |
4
|
5
|
| Available-for-sale securities, Gross Losses |
(2,899)
|
(3,133)
|
| Available-for-sale securities, Fair Value |
19,404
|
17,415
|
| Held-to-maturity securities, Amortized Cost |
15,748
|
17,050
|
| Held-to-maturity securities, Gross Gains |
7
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,039)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
13,716
|
14,752
|
| Municipal securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
3,536
|
3,527
|
| Available-for-sale securities, Gross Gains |
2
|
1
|
| Available-for-sale securities, Gross Losses |
(165)
|
(238)
|
| Available-for-sale securities, Fair Value |
3,373
|
3,290
|
| Held-to-maturity securities, Amortized Cost |
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 |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
131
|
146
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(12)
|
(18)
|
| Available-for-sale securities, Fair Value |
119
|
128
|
| Asset-backed securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
387
|
416
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(31)
|
(44)
|
| Available-for-sale securities, Fair Value |
356
|
372
|
| Corporate debt |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
2,202
|
2,467
|
| Available-for-sale securities, Gross Gains |
79
|
132
|
| Available-for-sale securities, Gross Losses |
(238)
|
(385)
|
| Available-for-sale securities, Fair Value |
2,043
|
2,214
|
| Other securities/Sovereign debt |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
10
|
4
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities, Fair Value |
10
|
4
|
| Other non-marketable equity securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Other securities, Amortized Cost |
17
|
10
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
17
|
10
|
| Mutual funds |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Other securities, Amortized Cost |
30
|
31
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
30
|
31
|
| Equity securities |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Other securities, Amortized Cost |
1
|
1
|
| Other securities, Gross Gains |
1
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
2
|
1
|
| Debt Securities, Available-For-Sale |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Accrued interest receivable |
61
|
64
|
| Debt Securities, Held-To-Maturity Securitas |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Accrued interest receivable |
36
|
39
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Other securities, Amortized Cost |
169
|
312
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
169
|
312
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Schedule of investment securities and other securities [Line Items] |
|
|
| Other securities, Amortized Cost |
507
|
500
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 507
|
$ 500
|