Investment Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions |
6 Months Ended |
|
Jun. 30, 2025 |
Dec. 31, 2024 |
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
$ 70,552
|
$ 59,006
|
| Available for sale, gross unrealized gains |
253
|
172
|
| Available for sale, gross unrealized losses |
202
|
283
|
| Available-for-sale, fair value |
70,603
|
58,895
|
| Held to maturity, amortized cost |
43,286
|
47,727
|
| Investment securities held-to-maturity |
38,485
|
41,906
|
| Direct obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
26,828
|
23,539
|
| Available for sale, gross unrealized gains |
30
|
38
|
| Available for sale, gross unrealized losses |
47
|
52
|
| Available-for-sale, fair value |
26,811
|
23,525
|
| Held to maturity, amortized cost |
3,059
|
5,417
|
| Held to maturity, gross unrealized gains |
0
|
0
|
| Held to maturity, gross unrealized losses |
19
|
55
|
| Investment securities held-to-maturity |
3,040
|
5,362
|
| Mortgage-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
14,963
|
10,699
|
| Available for sale, gross unrealized gains |
38
|
21
|
| Available for sale, gross unrealized losses |
134
|
154
|
| Available-for-sale, fair value |
14,867
|
10,566
|
| Held to maturity, amortized cost |
34,530
|
36,101
|
| Held to maturity, gross unrealized gains |
10
|
2
|
| Held to maturity, gross unrealized losses |
4,726
|
5,677
|
| Investment securities held-to-maturity |
29,814
|
30,426
|
| Total U.S. Treasury and federal agencies |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
41,791
|
34,238
|
| Available for sale, gross unrealized gains |
68
|
59
|
| Available for sale, gross unrealized losses |
181
|
206
|
| Available-for-sale, fair value |
41,678
|
34,091
|
| Held to maturity, amortized cost |
37,589
|
41,518
|
| Held to maturity, gross unrealized gains |
10
|
2
|
| Held to maturity, gross unrealized losses |
4,745
|
5,732
|
| Investment securities held-to-maturity |
32,854
|
35,788
|
| Mortgage-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,004
|
2,426
|
| Available for sale, gross unrealized gains |
6
|
5
|
| Available for sale, gross unrealized losses |
1
|
1
|
| Available-for-sale, fair value |
3,009
|
2,430
|
| Asset-backed securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
2,458
|
1,865
|
| Available for sale, gross unrealized gains |
6
|
5
|
| Available for sale, gross unrealized losses |
2
|
2
|
| Available-for-sale, fair value |
2,462
|
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 |
16,413
|
13,954
|
| Available for sale, gross unrealized gains |
111
|
54
|
| Available for sale, gross unrealized losses |
16
|
69
|
| Available-for-sale, fair value |
16,508
|
13,939
|
| Held to maturity, amortized cost |
3,299
|
3,673
|
| Held to maturity, gross unrealized gains |
10
|
7
|
| Held to maturity, gross unrealized losses |
46
|
73
|
| Investment securities held-to-maturity |
3,263
|
3,607
|
| Other |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,220
|
2,787
|
| Available for sale, gross unrealized gains |
52
|
38
|
| Available for sale, gross unrealized losses |
1
|
4
|
| Available-for-sale, fair value |
3,271
|
2,821
|
| Total non-U.S. debt securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
25,095
|
21,032
|
| Available for sale, gross unrealized gains |
175
|
102
|
| Available for sale, gross unrealized losses |
20
|
76
|
| Available-for-sale, fair value |
25,250
|
21,058
|
| Held to maturity, amortized cost |
3,299
|
3,673
|
| Held to maturity, gross unrealized gains |
10
|
7
|
| Held to maturity, gross unrealized losses |
46
|
73
|
| Investment securities held-to-maturity |
3,263
|
3,607
|
| Student loans |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
84
|
89
|
| Available for sale, gross unrealized gains |
0
|
1
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
84
|
90
|
| Held to maturity, amortized cost |
2,398
|
2,536
|
| Held to maturity, gross unrealized gains |
4
|
4
|
| Held to maturity, gross unrealized losses |
34
|
29
|
| Investment securities held-to-maturity |
2,368
|
2,511
|
| Collateralized loan obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
3,435
|
3,447
|
| Available for sale, gross unrealized gains |
5
|
6
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
3,440
|
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 |
3,609
|
3,627
|
| Available for sale, gross unrealized gains |
10
|
11
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
3,619
|
3,638
|
| Held to maturity, amortized cost |
2,398
|
2,536
|
| Held to maturity, gross unrealized gains |
4
|
4
|
| Held to maturity, gross unrealized losses |
34
|
29
|
| Investment securities held-to-maturity |
2,368
|
2,511
|
| State and political subdivisions |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
30
|
56
|
| Available for sale, gross unrealized gains |
0
|
0
|
| Available for sale, gross unrealized losses |
0
|
0
|
| Available-for-sale, fair value |
30
|
56
|
| Other U.S. debt securities |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
27
|
53
|
| Available for sale, gross unrealized gains |
0
|
0
|
| Available for sale, gross unrealized losses |
1
|
1
|
| Available-for-sale, fair value |
26
|
52
|
| Including MMLF |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Held to maturity, amortized cost |
43,286
|
47,727
|
| Held to maturity, gross unrealized gains |
24
|
13
|
| Held to maturity, gross unrealized losses |
4,825
|
5,834
|
| Investment securities held-to-maturity |
38,485
|
41,906
|
| Agency CMBS |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
4,140
|
4,360
|
| Held to maturity, amortized cost |
5,140
|
5,180
|
| Agency MBS |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
6,060
|
6,200
|
| Non-US collateralized loan obligations |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
850
|
700
|
| Non-U.S. debt securities, corporate bonds |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
$ 2,610
|
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%
|
|
| US debt securities, corporate bonds |
|
|
| Available-For-Sale and Held-To-Maturity-Securities [Line Items] |
|
|
| Available for sale, amortized cost |
$ 30
|
$ 50
|