Investment Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions |
9 Months Ended |
|
Sep. 30, 2025 |
Dec. 31, 2024 |
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
$ 69,300
|
$ 59,006
|
| Available for sale, gross unrealized gains |
284
|
172
|
| Available for sale, gross unrealized losses |
141
|
283
|
| Available-for-sale, fair value |
69,443
|
58,895
|
| Held to maturity, amortized cost |
40,934
|
47,727
|
| Investment securities held-to-maturity |
36,654
|
41,906
|
| Direct obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
24,136
|
23,539
|
| Available for sale, gross unrealized gains |
42
|
38
|
| Available for sale, gross unrealized losses |
25
|
52
|
| Available-for-sale, fair value |
24,153
|
23,525
|
| Held to maturity, amortized cost |
2,011
|
5,417
|
| Held to maturity, gross unrealized gains |
0
|
0
|
| Held to maturity, gross unrealized losses |
8
|
55
|
| Investment securities held-to-maturity |
2,003
|
5,362
|
| Mortgage-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
15,565
|
10,699
|
| Available for sale, gross unrealized gains |
79
|
21
|
| Available for sale, gross unrealized losses |
93
|
154
|
| Available-for-sale, fair value |
15,551
|
10,566
|
| Held to maturity, amortized cost |
33,683
|
36,101
|
| Held to maturity, gross unrealized gains |
6
|
2
|
| Held to maturity, gross unrealized losses |
4,228
|
5,677
|
| Investment securities held-to-maturity |
29,461
|
30,426
|
| Total U.S. Treasury and federal agencies |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
39,701
|
34,238
|
| Available for sale, gross unrealized gains |
121
|
59
|
| Available for sale, gross unrealized losses |
118
|
206
|
| Available-for-sale, fair value |
39,704
|
34,091
|
| Held to maturity, amortized cost |
35,694
|
41,518
|
| Held to maturity, gross unrealized gains |
6
|
2
|
| Held to maturity, gross unrealized losses |
4,236
|
5,732
|
| Investment securities held-to-maturity |
31,464
|
35,788
|
| Mortgage-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
2,783
|
2,426
|
| Available for sale, gross unrealized gains |
10
|
5
|
| Available for sale, gross unrealized losses |
1
|
1
|
| Available-for-sale, fair value |
2,792
|
2,430
|
| Asset-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
2,374
|
1,865
|
| Available for sale, gross unrealized gains |
7
|
5
|
| Available for sale, gross unrealized losses |
1
|
2
|
| Available-for-sale, fair value |
2,380
|
1,868
|
| Non-U.S. sovereign, supranational and non-U.S. agency |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
18,396
|
13,954
|
| Available for sale, gross unrealized gains |
89
|
54
|
| Available for sale, gross unrealized losses |
21
|
69
|
| Available-for-sale, fair value |
18,464
|
13,939
|
| Held to maturity, amortized cost |
2,908
|
3,673
|
| Held to maturity, gross unrealized gains |
7
|
7
|
| Held to maturity, gross unrealized losses |
38
|
73
|
| Investment securities held-to-maturity |
2,877
|
3,607
|
| Other |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,014
|
2,787
|
| Available for sale, gross unrealized gains |
48
|
38
|
| Available for sale, gross unrealized losses |
0
|
4
|
| Available-for-sale, fair value |
3,062
|
2,821
|
| Total non-U.S. debt securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
26,567
|
21,032
|
| Available for sale, gross unrealized gains |
154
|
102
|
| Available for sale, gross unrealized losses |
23
|
76
|
| Available-for-sale, fair value |
26,698
|
21,058
|
| Held to maturity, amortized cost |
2,908
|
3,673
|
| Held to maturity, gross unrealized gains |
7
|
7
|
| Held to maturity, gross unrealized losses |
38
|
73
|
| Investment securities held-to-maturity |
2,877
|
3,607
|
| Student loans |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
81
|
89
|
| Available for sale, gross unrealized gains |
0
|
1
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
81
|
90
|
| Held to maturity, amortized cost |
2,332
|
2,536
|
| Held to maturity, gross unrealized gains |
6
|
4
|
| Held to maturity, gross unrealized losses |
25
|
29
|
| Investment securities held-to-maturity |
2,313
|
2,511
|
| Collateralized loan obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
2,832
|
3,447
|
| Available for sale, gross unrealized gains |
4
|
6
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
2,836
|
3,453
|
| Non-agency CMBS and RMBS |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
0
|
1
|
| Available for sale, gross unrealized gains |
4
|
3
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
4
|
4
|
| Other |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
90
|
90
|
| Available for sale, gross unrealized gains |
1
|
1
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
91
|
91
|
| Total asset-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,003
|
3,627
|
| Available for sale, gross unrealized gains |
9
|
11
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
3,012
|
3,638
|
| Held to maturity, amortized cost |
2,332
|
2,536
|
| Held to maturity, gross unrealized gains |
6
|
4
|
| Held to maturity, gross unrealized losses |
25
|
29
|
| Investment securities held-to-maturity |
2,313
|
2,511
|
| State and political subdivisions |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
26
|
56
|
| Available for sale, gross unrealized gains |
0
|
0
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
26
|
56
|
| Other U.S. debt securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3
|
53
|
| Available for sale, gross unrealized gains |
0
|
0
|
| Available for sale, gross unrealized losses |
0
|
1
|
| Available-for-sale, fair value |
3
|
52
|
| Including MMLF |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Held to maturity, amortized cost |
40,934
|
47,727
|
| Held to maturity, gross unrealized gains |
19
|
13
|
| Held to maturity, gross unrealized losses |
4,299
|
5,834
|
| Investment securities held-to-maturity |
36,654
|
41,906
|
| Agency CMBS |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,290
|
4,360
|
| Held to maturity, amortized cost |
5,120
|
5,180
|
| Agency MBS |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
12,260
|
6,200
|
| Non-US collateralized loan obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
890
|
700
|
| Non-U.S. debt securities, corporate bonds |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
$ 2,410
|
$ 2,540
|
| Federal family education loan program |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Federal government credit support guarantee, percentage minimum |
97.00%
|
|