INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Sep. 30, 2023 |
Dec. 31, 2022 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 26,262
|
$ 27,103
|
| Available-for-sale securities, Gross Gains |
111
|
138
|
| Available-for-sale securities, Gross Losses |
(4,510)
|
(3,818)
|
| Available-for-sale securities |
21,863
|
23,423
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,148
|
17,052
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,839)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
13,309
|
14,754
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
718
|
854
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
718
|
854
|
| Cumulative basis adjustments associated with hedging relationships |
916
|
849
|
| U.S. Treasury |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
5
|
103
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities |
5
|
103
|
| Residential CMO |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,661
|
3,336
|
| Available-for-sale securities, Gross Gains |
1
|
0
|
| Available-for-sale securities, Gross Losses |
(531)
|
(422)
|
| Available-for-sale securities |
3,131
|
2,914
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
4,881
|
4,970
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(839)
|
(714)
|
| Held-to-maturity securities, Fair Value |
4,042
|
4,260
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
13,445
|
14,349
|
| Available-for-sale securities, Gross Gains |
0
|
4
|
| Available-for-sale securities, Gross Losses |
(2,529)
|
(2,090)
|
| Available-for-sale securities |
10,916
|
12,263
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
9,578
|
10,295
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(1,691)
|
(1,375)
|
| Held-to-maturity securities, Fair Value |
7,887
|
8,920
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,544
|
2,565
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(815)
|
(612)
|
| Available-for-sale securities |
1,729
|
1,953
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,580
|
1,652
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(300)
|
(204)
|
| Held-to-maturity securities, Fair Value |
1,280
|
1,448
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
168
|
190
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
(9)
|
(9)
|
| Available-for-sale securities |
159
|
182
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
107
|
133
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(9)
|
(9)
|
| Held-to-maturity securities, Fair Value |
98
|
124
|
| Total U.S. Treasury, federal agency, and other agency securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
19,823
|
20,543
|
| Available-for-sale securities, Gross Gains |
1
|
5
|
| Available-for-sale securities, Gross Losses |
(3,884)
|
(3,133)
|
| Available-for-sale securities |
15,940
|
17,415
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,146
|
17,050
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,839)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
13,307
|
14,752
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,702
|
3,527
|
| Available-for-sale securities, Gross Gains |
1
|
1
|
| Available-for-sale securities, Gross Losses |
(226)
|
(238)
|
| Available-for-sale securities |
3,477
|
3,290
|
| 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 |
133
|
146
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(15)
|
(18)
|
| Available-for-sale securities |
118
|
128
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
391
|
416
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(40)
|
(44)
|
| Available-for-sale securities |
351
|
372
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,209
|
2,467
|
| Available-for-sale securities, Gross Gains |
109
|
132
|
| Available-for-sale securities, Gross Losses |
(345)
|
(385)
|
| Available-for-sale securities |
1,973
|
2,214
|
| Other securities/Sovereign debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
4
|
4
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
0
|
0
|
| Available-for-sale securities |
4
|
4
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
15
|
10
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
15
|
10
|
| Mutual funds |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
29
|
31
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
29
|
31
|
| Equity securities |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
1
|
1
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
1
|
1
|
| Debt Securities, Available-For-Sale Securities |
|
|
| Other securities, at cost: |
|
|
| Accrued interest receivable |
70
|
64
|
| Debt Securities, Held-To-Maturity Securities |
|
|
| Other securities, at cost: |
|
|
| Accrued interest receivable |
37
|
39
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
156
|
312
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
156
|
312
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Other securities, at cost: |
|
|
| Other securities, Amortized Cost |
517
|
500
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 517
|
$ 500
|