Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Sep. 30, 2018 |
Dec. 31, 2017 |
| Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 4
|
|
| Due in One Year or Less, Yield |
3.36%
|
|
| Due after One Year through Five Years, Amount |
$ 55
|
|
| Due after One Year through Five Years, Yield |
3.62%
|
|
| Due after Five Years through Ten Years, Amount |
$ 1,484
|
|
| Due after Five Years though Ten Years, Yield |
2.76%
|
|
| Due after Ten Years, Amount |
$ 192,929
|
|
| Due after Ten Years, Yield |
3.22%
|
|
| Amortized Cost |
$ 194,472
|
$ 125,013
|
| Total, Yield |
3.22%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 251,635
|
315,117
|
| Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Due in One Year or Less, Amount |
4
|
|
| Due after One Year through Five Years, Amount |
55
|
|
| Due after Five Years though Ten Years, Amount |
1,415
|
|
| Due after Ten Years, Amount |
186,514
|
|
| Held-to-maturity Securities, Fair Value |
187,988
|
$ 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 |
$ 314
|
|
| Due in One Year or Less, Yield |
1.74%
|
|
| Due after One Year through Five Years, Amount |
$ 2,415
|
|
| Due after One Year through Five Years, Yield |
2.38%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,171
|
|
| Due after Five Years though Ten Years, Yield |
2.50%
|
|
| Due after Ten Years, Amount |
$ 151,295
|
|
| Due after Ten Years, Yield |
3.45%
|
|
| Total, Amount |
$ 165,195
|
|
| Total, Yield |
3.36%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 312
|
|
| Due after One Year through Five Years, Amount |
2,348
|
|
| Due after Five Years though Ten Years, Amount |
10,655
|
|
| Due after Ten Years, Amount |
145,818
|
|
| Debt securities carried at fair value |
159,133
|
|
| Agency |
|
|
| 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 |
$ 24
|
|
| Due after One Year through Five Years, Yield |
4.12%
|
|
| Due after Five Years though Ten Years, Amount |
$ 463
|
|
| Due after Five Years though Ten Years, Yield |
2.62%
|
|
| Due after Ten Years, Amount |
$ 141,234
|
|
| Due after Ten Years, Yield |
3.31%
|
|
| Total, Amount |
$ 141,721
|
|
| Total, Yield |
3.31%
|
|
| 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 |
25
|
|
| Due after Five Years though Ten Years, Amount |
452
|
|
| Due after Ten Years, Amount |
135,635
|
|
| Debt securities carried at fair value |
136,112
|
|
| 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 |
$ 31
|
|
| Due after Five Years though Ten Years, Yield |
2.48%
|
|
| Due after Ten Years, Amount |
$ 5,847
|
|
| Due after Ten Years, Yield |
3.17%
|
|
| Total, Amount |
$ 5,878
|
|
| 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 |
29
|
|
| Due after Ten Years, Amount |
5,649
|
|
| Debt securities carried at fair value |
5,678
|
|
| Commercial |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 314
|
|
| Due in One Year or Less, Yield |
1.74%
|
|
| Due after One Year through Five Years, Amount |
$ 2,391
|
|
| Due after One Year through Five Years, Yield |
2.36%
|
|
| Due after Five Years though Ten Years, Amount |
$ 10,658
|
|
| Due after Five Years though Ten Years, Yield |
2.50%
|
|
| Due after Ten Years, Amount |
$ 775
|
|
| Due after Ten Years, Yield |
2.97%
|
|
| Total, Amount |
$ 14,138
|
|
| Total, Yield |
2.49%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 312
|
|
| Due after One Year through Five Years, Amount |
2,323
|
|
| Due after Five Years though Ten Years, Amount |
10,138
|
|
| Due after Ten Years, Amount |
737
|
|
| Debt securities carried at fair value |
13,510
|
|
| 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 |
$ 19
|
|
| Due after Ten Years, Amount |
$ 3,439
|
|
| Due after Ten Years, Yield |
9.66%
|
|
| Total, Amount |
$ 3,458
|
|
| Total, Yield |
9.61%
|
|
| 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 |
36
|
|
| Due after Ten Years, Amount |
3,797
|
|
| Debt securities carried at fair value |
3,833
|
|
| 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 |
$ 643
|
|
| Due in One Year or Less, Yield |
0.71%
|
|
| Due after One Year through Five Years, Amount |
$ 33,567
|
|
| Due after One Year through Five Years, Yield |
1.47%
|
|
| Due after Five Years though Ten Years, Amount |
$ 20,418
|
|
| Due after Five Years though Ten Years, Yield |
2.27%
|
|
| Due after Ten Years, Amount |
$ 36
|
|
| Due after Ten Years, Yield |
2.70%
|
|
| Total, Amount |
$ 54,664
|
|
| Total, Yield |
1.76%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 642
|
|
| Due after One Year through Five Years, Amount |
32,106
|
|
| Due after Five Years though Ten Years, Amount |
19,523
|
|
| Due after Ten Years, Amount |
35
|
|
| Debt securities carried at fair value |
52,306
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,518
|
|
| Due in One Year or Less, Yield |
0.77%
|
|
| Due after One Year through Five Years, Amount |
$ 1,305
|
|
| Due after One Year through Five Years, Yield |
1.08%
|
|
| Due after Five Years though Ten Years, Amount |
$ 2
|
|
| Due after Five Years though Ten Years, Yield |
3.56%
|
|
| Due after Ten Years, Amount |
$ 128
|
|
| Due after Ten Years, Yield |
6.15%
|
|
| Total, Amount |
$ 17,953
|
|
| Total, Yield |
0.83%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,519
|
|
| Due after One Year through Five Years, Amount |
1,314
|
|
| Due after Five Years though Ten Years, Amount |
2
|
|
| Due after Ten Years, Amount |
132
|
|
| Debt securities carried at fair value |
17,967
|
|
| 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 |
$ 685
|
|
| Due in One Year or Less, Yield |
3.88%
|
|
| Due after One Year through Five Years, Amount |
$ 2,236
|
|
| Due after One Year through Five Years, Yield |
3.28%
|
|
| Due after Five Years though Ten Years, Amount |
$ 789
|
|
| Due after Five Years though Ten Years, Yield |
3.47%
|
|
| Due after Ten Years, Amount |
$ 96
|
|
| Due after Ten Years, Yield |
4.68%
|
|
| Total, Amount |
$ 3,806
|
|
| Total, Yield |
3.46%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 681
|
|
| Due after One Year through Five Years, Amount |
2,255
|
|
| Due after Five Years though Ten Years, Amount |
829
|
|
| Due after Ten Years, Amount |
114
|
|
| Debt securities carried at fair value |
3,879
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 18,160
|
|
| Due in One Year or Less, Yield |
0.90%
|
|
| Due after One Year through Five Years, Amount |
$ 39,523
|
|
| Due after One Year through Five Years, Yield |
1.61%
|
|
| Due after Five Years though Ten Years, Amount |
$ 32,380
|
|
| Due after Five Years though Ten Years, Yield |
2.38%
|
|
| Due after Ten Years, Amount |
$ 151,555
|
|
| Due after Ten Years, Yield |
3.45%
|
|
| Total, Amount |
$ 241,618
|
|
| Total, Yield |
2.82%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 18,154
|
|
| Due after One Year through Five Years, Amount |
38,023
|
|
| Due after Five Years though Ten Years, Amount |
31,009
|
|
| Due after Ten Years, Amount |
146,099
|
|
| Debt securities carried at fair value |
233,285
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,737
|
|
| Due in One Year or Less, Yield |
2.57%
|
|
| Due after One Year through Five Years, Amount |
$ 7,234
|
|
| Due after One Year through Five Years, Yield |
2.42%
|
|
| Due after Five Years though Ten Years, Amount |
$ 6,929
|
|
| Due after Five Years though Ten Years, Yield |
2.38%
|
|
| Due after Ten Years, Amount |
$ 2,501
|
|
| Due after Ten Years, Yield |
2.78%
|
|
| Total, Amount |
$ 18,401
|
|
| Total, Yield |
2.47%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,736
|
|
| Due after One Year through Five Years, Amount |
7,235
|
|
| Due after Five Years though Ten Years, Amount |
6,897
|
|
| Due after Ten Years, Amount |
2,482
|
|
| Debt securities carried at fair value |
18,350
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 19,897
|
|
| Due in One Year or Less, Yield |
1.05%
|
|
| Due after One Year through Five Years, Amount |
$ 46,757
|
|
| Due after One Year through Five Years, Yield |
1.74%
|
|
| Due after Five Years though Ten Years, Amount |
$ 39,309
|
|
| Due after Five Years though Ten Years, Yield |
2.38%
|
|
| Due after Ten Years, Amount |
$ 154,056
|
|
| Due after Ten Years, Yield |
3.44%
|
|
| Total, Amount |
$ 260,019
|
|
| Total, Yield |
2.79%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 19,890
|
|
| Due after One Year through Five Years, Amount |
45,258
|
|
| Due after Five Years though Ten Years, Amount |
37,906
|
|
| Due after Ten Years, Amount |
148,581
|
|
| Debt securities carried at fair value |
$ 251,635
|
|