Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 2
|
|
| Due in One Year or Less, Yield |
4.35%
|
|
| Due after One Year through Five Years, Amount |
$ 67
|
|
| Due after One Year through Five Years, Yield |
3.84%
|
|
| Due after Five Years through Ten Years, Amount |
$ 1,358
|
|
| Due after Five Years though Ten Years, Yield |
2.74%
|
|
| Due after Ten Years, Amount |
$ 122,112
|
|
| Due after Ten Years, Yield |
3.04%
|
|
| Amortized Cost |
$ 123,539
|
$ 125,013
|
| Total, Yield |
3.04%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 303,298
|
315,117
|
| Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Due in One Year or Less, Amount |
2
|
|
| Due after One Year through Five Years, Amount |
67
|
|
| Due after Five Years though Ten Years, Amount |
1,307
|
|
| Due after Ten Years, Amount |
117,756
|
|
| Held-to-maturity Securities, Fair Value |
119,132
|
$ 123,299
|
| Mortgage-backed securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 56
|
|
| Due in One Year or Less, Yield |
9.40%
|
|
| Due after One Year through Five Years, Amount |
$ 1,688
|
|
| Due after One Year through Five Years, Yield |
2.18%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,923
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 201,147
|
|
| Due after Ten Years, Yield |
3.37%
|
|
| Total, Amount |
$ 214,814
|
|
| Total, Yield |
3.31%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 56
|
|
| Due after One Year through Five Years, Amount |
1,662
|
|
| Due after Five Years though Ten Years, Amount |
11,548
|
|
| Due after Ten Years, Amount |
196,142
|
|
| Debt securities carried at fair value |
209,408
|
|
| Agency |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 2
|
|
| Due in One Year or Less, Yield |
5.50%
|
|
| Due after One Year through Five Years, Amount |
$ 26
|
|
| Due after One Year through Five Years, Yield |
3.94%
|
|
| Due after Five Years though Ten Years, Amount |
$ 519
|
|
| Due after Five Years though Ten Years, Yield |
2.57%
|
|
| Due after Ten Years, Amount |
$ 188,879
|
|
| Due after Ten Years, Yield |
3.22%
|
|
| Total, Amount |
$ 189,426
|
|
| Total, Yield |
3.22%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 2
|
|
| Due after One Year through Five Years, Amount |
27
|
|
| Due after Five Years though Ten Years, Amount |
512
|
|
| Due after Ten Years, Amount |
183,570
|
|
| Debt securities carried at fair value |
184,111
|
|
| Agency-collateralized mortgage obligations |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 0
|
|
| Due in One Year or Less, Yield |
0.00%
|
|
| Due after One Year through Five Years, Amount |
$ 0
|
|
| Due after One Year through Five Years, Yield |
0.00%
|
|
| Due after Five Years though Ten Years, Amount |
$ 32
|
|
| Due after Five Years though Ten Years, Yield |
2.53%
|
|
| Due after Ten Years, Amount |
$ 6,493
|
|
| Due after Ten Years, Yield |
3.17%
|
|
| Total, Amount |
$ 6,525
|
|
| Total, Yield |
3.17%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 0
|
|
| Due after One Year through Five Years, Amount |
0
|
|
| Due after Five Years though Ten Years, Amount |
31
|
|
| Due after Ten Years, Amount |
6,367
|
|
| Debt securities carried at fair value |
6,398
|
|
| Commercial |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 54
|
|
| Due in One Year or Less, Yield |
9.55%
|
|
| Due after One Year through Five Years, Amount |
$ 1,662
|
|
| Due after One Year through Five Years, Yield |
2.15%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,350
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 932
|
|
| Due after Ten Years, Yield |
2.61%
|
|
| Total, Amount |
$ 13,998
|
|
| Total, Yield |
2.44%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 54
|
|
| Due after One Year through Five Years, Amount |
1,635
|
|
| Due after Five Years though Ten Years, Amount |
10,973
|
|
| Due after Ten Years, Amount |
897
|
|
| Debt securities carried at fair value |
13,559
|
|
| Non-agency residential |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 0
|
|
| Due in One Year or Less, Yield |
0.00%
|
|
| Due after One Year through Five Years, Amount |
$ 0
|
|
| Due after One Year through Five Years, Yield |
0.00%
|
|
| Due after Five Years though Ten Years, Amount |
$ 22
|
|
| Due after Five Years though Ten Years, Yield |
0.01%
|
|
| Due after Ten Years, Amount |
$ 4,843
|
|
| Due after Ten Years, Yield |
9.44%
|
|
| Total, Amount |
$ 4,865
|
|
| Total, Yield |
9.40%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 0
|
|
| Due after One Year through Five Years, Amount |
0
|
|
| Due after Five Years though Ten Years, Amount |
32
|
|
| Due after Ten Years, Amount |
5,308
|
|
| Debt securities carried at fair value |
5,340
|
|
| U.S. Treasury and agency securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 543
|
|
| Due in One Year or Less, Yield |
0.41%
|
|
| Due after One Year through Five Years, Amount |
$ 26,339
|
|
| Due after One Year through Five Years, Yield |
1.41%
|
|
| Due after Five Years though Ten Years, Amount |
$ 27,849
|
|
| Due after Five Years though Ten Years, Yield |
2.12%
|
|
| Due after Ten Years, Amount |
$ 22
|
|
| Due after Ten Years, Yield |
2.57%
|
|
| Total, Amount |
$ 54,753
|
|
| Total, Yield |
1.76%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 541
|
|
| Due after One Year through Five Years, Amount |
25,460
|
|
| Due after Five Years though Ten Years, Amount |
26,950
|
|
| Due after Ten Years, Amount |
21
|
|
| Debt securities carried at fair value |
52,972
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 14,405
|
|
| Due in One Year or Less, Yield |
0.95%
|
|
| Due after One Year through Five Years, Amount |
$ 2,110
|
|
| Due after One Year through Five Years, Yield |
0.92%
|
|
| Due after Five Years though Ten Years, Amount |
$ 214
|
|
| Due after Five Years though Ten Years, Yield |
1.17%
|
|
| Due after Ten Years, Amount |
$ 153
|
|
| Due after Ten Years, Yield |
6.64%
|
|
| Total, Amount |
$ 16,882
|
|
| Total, Yield |
1.00%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 14,403
|
|
| Due after One Year through Five Years, Amount |
2,125
|
|
| Due after Five Years though Ten Years, Amount |
214
|
|
| Due after Ten Years, Amount |
159
|
|
| Debt securities carried at fair value |
16,901
|
|
| Other taxable securities, substantially all asset-backed securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 972
|
|
| Due in One Year or Less, Yield |
3.12%
|
|
| Due after One Year through Five Years, Amount |
$ 2,496
|
|
| Due after One Year through Five Years, Yield |
3.21%
|
|
| Due after Five Years though Ten Years, Amount |
$ 1,072
|
|
| Due after Five Years though Ten Years, Yield |
3.43%
|
|
| Due after Ten Years, Amount |
$ 286
|
|
| Due after Ten Years, Yield |
8.13%
|
|
| Total, Amount |
$ 4,826
|
|
| Total, Yield |
3.54%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 967
|
|
| Due after One Year through Five Years, Amount |
2,493
|
|
| Due after Five Years though Ten Years, Amount |
1,122
|
|
| Due after Ten Years, Amount |
358
|
|
| Debt securities carried at fair value |
4,940
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 15,976
|
|
| Due in One Year or Less, Yield |
1.10%
|
|
| Due after One Year through Five Years, Amount |
$ 32,633
|
|
| Due after One Year through Five Years, Yield |
1.55%
|
|
| Due after Five Years though Ten Years, Amount |
$ 41,058
|
|
| Due after Five Years though Ten Years, Yield |
2.24%
|
|
| Due after Ten Years, Amount |
$ 201,608
|
|
| Due after Ten Years, Yield |
3.37%
|
|
| Total, Amount |
$ 291,275
|
|
| Total, Yield |
2.89%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 15,967
|
|
| Due after One Year through Five Years, Amount |
31,740
|
|
| Due after Five Years though Ten Years, Amount |
39,834
|
|
| Due after Ten Years, Amount |
196,680
|
|
| Debt securities carried at fair value |
284,221
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 691
|
|
| Due in One Year or Less, Yield |
1.58%
|
|
| Due after One Year through Five Years, Amount |
$ 6,922
|
|
| Due after One Year through Five Years, Yield |
2.10%
|
|
| Due after Five Years though Ten Years, Amount |
$ 8,626
|
|
| Due after Five Years though Ten Years, Yield |
2.07%
|
|
| Due after Ten Years, Amount |
$ 2,894
|
|
| Due after Ten Years, Yield |
1.94%
|
|
| Total, Amount |
$ 19,133
|
|
| Total, Yield |
2.04%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 691
|
|
| Due after One Year through Five Years, Amount |
6,930
|
|
| Due after Five Years though Ten Years, Amount |
8,582
|
|
| Due after Ten Years, Amount |
2,874
|
|
| Debt securities carried at fair value |
19,077
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,667
|
|
| Due in One Year or Less, Yield |
1.12%
|
|
| Due after One Year through Five Years, Amount |
$ 39,555
|
|
| Due after One Year through Five Years, Yield |
1.65%
|
|
| Due after Five Years though Ten Years, Amount |
$ 49,684
|
|
| Due after Five Years though Ten Years, Yield |
2.21%
|
|
| Due after Ten Years, Amount |
$ 204,502
|
|
| Due after Ten Years, Yield |
3.35%
|
|
| Total, Amount |
$ 310,408
|
|
| Total, Yield |
2.83%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,658
|
|
| Due after One Year through Five Years, Amount |
38,670
|
|
| Due after Five Years though Ten Years, Amount |
48,416
|
|
| Due after Ten Years, Amount |
199,554
|
|
| Debt securities carried at fair value |
$ 303,298
|
|