INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions |
Jun. 30, 2023 |
Dec. 31, 2022 |
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
$ 26,823
|
$ 27,103
|
| Available-for-sale securities, Gross Gains |
97
|
138
|
| Available-for-sale securities, Gross Losses |
(3,687)
|
(3,818)
|
| Available-for-sale securities |
23,233
|
23,423
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,578
|
17,052
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,270)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
14,308
|
14,754
|
| Other securities, Amortized Cost |
975
|
854
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
975
|
854
|
| Cumulative basis adjustments associated with hedging relationships |
843
|
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 |
3,742
|
3,336
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(434)
|
(422)
|
| Available-for-sale securities |
3,308
|
2,914
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
5,012
|
4,970
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(722)
|
(714)
|
| Held-to-maturity securities, Fair Value |
4,290
|
4,260
|
| Residential MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
13,789
|
14,349
|
| Available-for-sale securities, Gross Gains |
1
|
4
|
| Available-for-sale securities, Gross Losses |
(1,979)
|
(2,090)
|
| Available-for-sale securities |
11,811
|
12,263
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
9,835
|
10,295
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(1,294)
|
(1,375)
|
| Held-to-maturity securities, Fair Value |
8,541
|
8,920
|
| Commercial MBS |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,551
|
2,565
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(653)
|
(612)
|
| Available-for-sale securities |
1,898
|
1,953
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
1,613
|
1,652
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(245)
|
(204)
|
| Held-to-maturity securities, Fair Value |
1,368
|
1,448
|
| Other agencies |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
176
|
190
|
| Available-for-sale securities, Gross Gains |
0
|
1
|
| Available-for-sale securities, Gross Losses |
(8)
|
(9)
|
| Available-for-sale securities |
168
|
182
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
116
|
133
|
| Held-to-maturity securities, Gross Gains |
0
|
0
|
| Held-to-maturity securities, Gross Losses |
(9)
|
(9)
|
| Held-to-maturity securities, Fair Value |
107
|
124
|
| Total U.S. Treasury, federal agency, and other agency securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
20,263
|
20,543
|
| Available-for-sale securities, Gross Gains |
1
|
5
|
| Available-for-sale securities, Gross Losses |
(3,074)
|
(3,133)
|
| Available-for-sale securities |
17,190
|
17,415
|
| Held-to-maturity securities: |
|
|
| Held-to-maturity securities |
16,576
|
17,050
|
| Held-to-maturity securities, Gross Gains |
0
|
4
|
| Held-to-maturity securities, Gross Losses |
(2,270)
|
(2,302)
|
| Held-to-maturity securities, Fair Value |
14,306
|
14,752
|
| Municipal securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
3,778
|
3,527
|
| Available-for-sale securities, Gross Gains |
2
|
1
|
| Available-for-sale securities, Gross Losses |
(244)
|
(238)
|
| Available-for-sale securities |
3,536
|
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 |
138
|
146
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(15)
|
(18)
|
| Available-for-sale securities |
123
|
128
|
| Asset-backed securities |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
410
|
416
|
| Available-for-sale securities, Gross Gains |
0
|
0
|
| Available-for-sale securities, Gross Losses |
(41)
|
(44)
|
| Available-for-sale securities |
369
|
372
|
| Corporate debt |
|
|
| Available-for-sale securities: |
|
|
| Total available-for-sale securities |
2,230
|
2,467
|
| Available-for-sale securities, Gross Gains |
94
|
132
|
| Available-for-sale securities, Gross Losses |
(313)
|
(385)
|
| Available-for-sale securities |
2,011
|
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 |
|
|
| Held-to-maturity securities: |
|
|
| Other securities, Amortized Cost |
14
|
10
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
14
|
10
|
| Mutual funds |
|
|
| Held-to-maturity securities: |
|
|
| Other securities, Amortized Cost |
32
|
31
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
32
|
31
|
| Equity securities |
|
|
| Held-to-maturity securities: |
|
|
| Other securities, Amortized Cost |
1
|
1
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
1
|
1
|
| Available-for-sale Securities |
|
|
| Held-to-maturity securities: |
|
|
| Accrued interest receivable |
62
|
64
|
| Held-to-maturity Securities |
|
|
| Held-to-maturity securities: |
|
|
| Accrued interest receivable |
38
|
39
|
| Federal Home Loan Bank stock | Non-marketable equity securities: |
|
|
| Held-to-maturity securities: |
|
|
| Other securities, Amortized Cost |
412
|
312
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
412
|
312
|
| Federal Reserve Bank stock | Non-marketable equity securities: |
|
|
| Held-to-maturity securities: |
|
|
| Other securities, Amortized Cost |
516
|
500
|
| Other securities, Gross Gains |
0
|
0
|
| Other securities, Gross Losses |
0
|
0
|
| Other securities, Fair Value |
$ 516
|
$ 500
|