AFS and HTM Debt Securities, Outstanding (Details) - USD ($)
$ in Millions |
3 Months Ended |
12 Months Ended |
Mar. 31, 2026 |
Dec. 31, 2025 |
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
$ 226,400
|
$ 215,700
|
| Available-for sale, at amortized cost, net of allowance for credit losses, including portfolio level basis adjustments |
226,359
|
215,775
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
992
|
1,864
|
| Available-for-sale, gross unrealized gains |
992
|
1,864
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(4,519)
|
(3,991)
|
| Available-for-sale, gross unrealized losses |
(4,519)
|
(3,991)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(3,527)
|
(2,127)
|
| Available-for-sale, net unrealized gains (losses) |
(3,486)
|
(2,202)
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
222,873
|
213,573
|
| Available-for-sale debt securities, at fair value |
222,873
|
213,573
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
204,080
|
208,023
|
| Held-to-maturity, gross unrealized gains |
145
|
189
|
| Held-to-maturity, gross unrealized losses |
(32,927)
|
(32,415)
|
| Held-to-maturity, net unrealized gains (losses) |
(32,782)
|
(32,226)
|
| Held-to-maturity, at fair value |
171,298
|
175,797
|
| Total AFS and HTM Debt securities: |
|
|
| Amortized cost including portfolio level basis adjustment, net |
430,439
|
423,798
|
| Debt securities, gross unrealized gains |
1,137
|
2,053
|
| Debt securities, gross unrealized losses |
(37,446)
|
(36,406)
|
| Debt securities, net unrealized gains (losses) |
(36,268)
|
(34,428)
|
| Fair value |
$ 394,171
|
$ 389,370
|
| AFS and HTM Debt Securities Textual [Abstract] |
|
|
| Debt securities, available-for-sale, accounting policy election, accrued interest writeoff method [Fixed List] |
Reversing interest income
|
Reversing interest income
|
| Debt securities, held-to-maturity, accounting policy election, accrued interest writeoff method [Fixed List] |
Reversing interest income
|
Reversing interest income
|
| Debt securities, available-for-sale, excluded accrued interest from amortized cost [true false] |
true
|
true
|
| Debt securities, held-to-maturity, excluded accrued interest [true false] |
true
|
true
|
| Allowance for credit loss, available-for-sale debt securities |
$ 5
|
$ 23
|
| Allowance for credit loss, held-to-maturity debt securities |
93
|
95
|
| Fair value hedging [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Portfolio level basis adjustments |
(41)
|
75
|
| Reversal of portfolio level basis adjustments |
41
|
(75)
|
| Securities of U.S. Treasury and federal agencies [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
57,824
|
51,738
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
116
|
308
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(253)
|
(237)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(137)
|
71
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
57,687
|
51,809
|
| Available-for-sale debt securities, at fair value |
57,687
|
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
3,799
|
3,797
|
| Held-to-maturity, gross unrealized gains |
0
|
0
|
| Held-to-maturity, gross unrealized losses |
(1,767)
|
(1,747)
|
| Held-to-maturity, net unrealized gains (losses) |
(1,767)
|
(1,747)
|
| Held-to-maturity, at fair value |
2,032
|
2,050
|
| Securities of U.S. states and political subdivisions [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
10,278
|
10,706
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
23
|
34
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(358)
|
(343)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(335)
|
(309)
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
9,943
|
10,397
|
| Available-for-sale debt securities, at fair value |
9,943
|
10,397
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
17,400
|
17,476
|
| Held-to-maturity, gross unrealized gains |
1
|
2
|
| Held-to-maturity, gross unrealized losses |
(3,471)
|
(3,270)
|
| Held-to-maturity, net unrealized gains (losses) |
(3,470)
|
(3,268)
|
| Held-to-maturity, at fair value |
13,930
|
14,208
|
| Securities of U.S. states and political subdivisions [Member] | Nontaxable preferred debt securities [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
2,500
|
2,500
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
2,500
|
2,500
|
| Federal agency mortgage-backed securities [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
147,913
|
142,022
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
794
|
1,447
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(3,885)
|
(3,389)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(3,091)
|
(1,942)
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
144,822
|
140,080
|
| Available-for-sale debt securities, at fair value |
144,822
|
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
175,626
|
178,882
|
| Held-to-maturity, gross unrealized gains |
52
|
79
|
| Held-to-maturity, gross unrealized losses |
(27,647)
|
(27,353)
|
| Held-to-maturity, net unrealized gains (losses) |
(27,595)
|
(27,274)
|
| Held-to-maturity, at fair value |
148,031
|
151,608
|
| Non-agency mortgage-backed securities [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
1,868
|
2,141
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
2
|
3
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(12)
|
(18)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(10)
|
(15)
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
1,858
|
2,126
|
| Available-for-sale debt securities, at fair value |
1,858
|
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
1,522
|
1,497
|
| Held-to-maturity, gross unrealized gains |
73
|
82
|
| Held-to-maturity, gross unrealized losses |
(41)
|
(39)
|
| Held-to-maturity, net unrealized gains (losses) |
32
|
43
|
| Held-to-maturity, at fair value |
1,554
|
1,540
|
| Collateralized loan obligations [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
8,210
|
7,895
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
3
|
11
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(8)
|
(2)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
(5)
|
9
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
8,205
|
7,904
|
| Available-for-sale debt securities, at fair value |
8,205
|
7,904
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
4,016
|
4,655
|
| Held-to-maturity, gross unrealized gains |
10
|
19
|
| Held-to-maturity, gross unrealized losses |
0
|
0
|
| Held-to-maturity, net unrealized gains (losses) |
10
|
19
|
| Held-to-maturity, at fair value |
4,026
|
4,674
|
| Other debt securities [Member] |
|
|
| Available-for-sale debt securities: |
|
|
| Available-for-sale, at amortized cost, net of allowance for credit losses, excluding portfolio level basis adjustments |
307
|
1,198
|
| Available-for-sale, gross unrealized gains, excluding portfolio level basis adjustments |
54
|
61
|
| Available-for-sale, gross unrealized losses, excluding portfolio level basis adjustments |
(3)
|
(2)
|
| Available-for-sale, net unrealized gains (losses), excluding portfolio level basis adjustments |
51
|
59
|
| Available-for-sale, at fair value excluding portfolio level basis adjustments |
358
|
1,257
|
| Available-for-sale debt securities, at fair value |
358
|
|
| Held-to-maturity debt securities: |
|
|
| Held-to-maturity, amortized cost, net |
1,717
|
1,716
|
| Held-to-maturity, gross unrealized gains |
9
|
7
|
| Held-to-maturity, gross unrealized losses |
(1)
|
(6)
|
| Held-to-maturity, net unrealized gains (losses) |
8
|
1
|
| Held-to-maturity, at fair value |
$ 1,725
|
$ 1,717
|