Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Dec. 31, 2017 |
Dec. 31, 2016 |
| Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1
|
|
| Due in One Year or Less, Yield |
5.82%
|
|
| Due after One Year through Five Years, Amount |
$ 71
|
|
| Due after One Year through Five Years, Yield |
3.06%
|
|
| Due after Five Years through Ten Years, Amount |
$ 1,144
|
|
| Due after Five Years though Ten Years, Yield |
2.65%
|
|
| Due after Ten Years, Amount |
$ 123,797
|
|
| Due after Ten Years, Yield |
3.03%
|
|
| Amortized Cost |
$ 125,013
|
$ 117,071
|
| Total, Yield |
3.03%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 315,117
|
313,660
|
| Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Due in One Year or Less, Amount |
1
|
|
| Due after One Year through Five Years, Amount |
71
|
|
| Due after Five Years though Ten Years, Amount |
1,117
|
|
| Due after Ten Years, Amount |
122,110
|
|
| Held-to-maturity Securities, Fair Value |
123,299
|
$ 115,285
|
| Mortgage-backed securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 59
|
|
| Due in One Year or Less, Yield |
7.18%
|
|
| Due after One Year through Five Years, Amount |
$ 1,002
|
|
| Due after One Year through Five Years, Yield |
2.03%
|
|
| Due after Five Years though Ten Years, Amount |
$ 12,478
|
|
| Due after Five Years though Ten Years, Yield |
2.43%
|
|
| Due after Ten Years, Amount |
$ 206,273
|
|
| Due after Ten Years, Yield |
3.36%
|
|
| Total, Amount |
$ 219,812
|
|
| Total, Yield |
3.31%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 59
|
|
| Due after One Year through Five Years, Amount |
997
|
|
| Due after Five Years though Ten Years, Amount |
12,323
|
|
| Due after Ten Years, Amount |
205,476
|
|
| Debt securities carried at fair value |
218,855
|
|
| Agency |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 5
|
|
| Due in One Year or Less, Yield |
4.20%
|
|
| Due after One Year through Five Years, Amount |
$ 28
|
|
| Due after One Year through Five Years, Yield |
3.69%
|
|
| Due after Five Years though Ten Years, Amount |
$ 555
|
|
| Due after Five Years though Ten Years, Yield |
2.57%
|
|
| Due after Ten Years, Amount |
$ 193,531
|
|
| Due after Ten Years, Yield |
3.22%
|
|
| Total, Amount |
$ 194,119
|
|
| Total, Yield |
3.22%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 5
|
|
| Due after One Year through Five Years, Amount |
28
|
|
| Due after Five Years though Ten Years, Amount |
555
|
|
| Due after Ten Years, Amount |
192,341
|
|
| Debt securities carried at fair value |
192,929
|
|
| 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 |
$ 33
|
|
| Due after Five Years though Ten Years, Yield |
2.52%
|
|
| Due after Ten Years, Amount |
$ 6,817
|
|
| Due after Ten Years, Yield |
3.18%
|
|
| Total, Amount |
$ 6,850
|
|
| Total, Yield |
3.18%
|
|
| 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 |
6,777
|
|
| Debt securities carried at fair value |
6,809
|
|
| 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 |
7.45%
|
|
| Due after One Year through Five Years, Amount |
$ 974
|
|
| Due after One Year through Five Years, Yield |
1.98%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,866
|
|
| Due after Five Years though Ten Years, Yield |
2.43%
|
|
| Due after Ten Years, Amount |
$ 970
|
|
| Due after Ten Years, Yield |
2.78%
|
|
| Total, Amount |
$ 13,864
|
|
| 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 |
969
|
|
| Due after Five Years though Ten Years, Amount |
11,703
|
|
| Due after Ten Years, Amount |
958
|
|
| Debt securities carried at fair value |
13,684
|
|
| 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 |
$ 24
|
|
| Due after Five Years though Ten Years, Yield |
0.01%
|
|
| Due after Ten Years, Amount |
$ 4,955
|
|
| Due after Ten Years, Yield |
9.32%
|
|
| Total, Amount |
$ 4,979
|
|
| Total, Yield |
9.28%
|
|
| 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 |
33
|
|
| Due after Ten Years, Amount |
5,400
|
|
| Debt securities carried at fair value |
5,433
|
|
| 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 |
$ 490
|
|
| Due in One Year or Less, Yield |
0.39%
|
|
| Due after One Year through Five Years, Amount |
$ 23,395
|
|
| Due after One Year through Five Years, Yield |
1.42%
|
|
| Due after Five Years though Ten Years, Amount |
$ 30,615
|
|
| Due after Five Years though Ten Years, Yield |
2.03%
|
|
| Due after Ten Years, Amount |
$ 23
|
|
| Due after Ten Years, Yield |
2.52%
|
|
| Total, Amount |
$ 54,523
|
|
| Total, Yield |
1.75%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 491
|
|
| Due after One Year through Five Years, Amount |
22,898
|
|
| Due after Five Years though Ten Years, Amount |
30,111
|
|
| Due after Ten Years, Amount |
23
|
|
| Debt securities carried at fair value |
53,523
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 13,832
|
|
| Due in One Year or Less, Yield |
1.02%
|
|
| Due after One Year through Five Years, Amount |
$ 2,111
|
|
| Due after One Year through Five Years, Yield |
0.97%
|
|
| Due after Five Years though Ten Years, Amount |
$ 48
|
|
| Due after Five Years though Ten Years, Yield |
0.72%
|
|
| Due after Ten Years, Amount |
$ 167
|
|
| Due after Ten Years, Yield |
6.60%
|
|
| Total, Amount |
$ 16,158
|
|
| Total, Yield |
1.07%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 13,830
|
|
| Due after One Year through Five Years, Amount |
2,115
|
|
| Due after Five Years though Ten Years, Amount |
48
|
|
| Due after Ten Years, Amount |
172
|
|
| Debt securities carried at fair value |
16,165
|
|
| 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 |
$ 1,979
|
|
| Due in One Year or Less, Yield |
2.53%
|
|
| Due after One Year through Five Years, Amount |
$ 2,029
|
|
| Due after One Year through Five Years, Yield |
3.02%
|
|
| Due after Five Years though Ten Years, Amount |
$ 1,151
|
|
| Due after Five Years though Ten Years, Yield |
3.22%
|
|
| Due after Ten Years, Amount |
$ 751
|
|
| Due after Ten Years, Yield |
4.74%
|
|
| Total, Amount |
$ 5,910
|
|
| Total, Yield |
3.11%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,981
|
|
| Due after One Year through Five Years, Amount |
2,006
|
|
| Due after Five Years though Ten Years, Amount |
1,184
|
|
| Due after Ten Years, Amount |
828
|
|
| Debt securities carried at fair value |
5,999
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,360
|
|
| Due in One Year or Less, Yield |
1.21%
|
|
| Due after One Year through Five Years, Amount |
$ 28,537
|
|
| Due after One Year through Five Years, Yield |
1.52%
|
|
| Due after Five Years though Ten Years, Amount |
$ 44,292
|
|
| Due after Five Years though Ten Years, Yield |
2.17%
|
|
| Due after Ten Years, Amount |
$ 207,214
|
|
| Due after Ten Years, Yield |
3.37%
|
|
| Total, Amount |
$ 296,403
|
|
| Total, Yield |
2.89%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,361
|
|
| Due after One Year through Five Years, Amount |
28,016
|
|
| Due after Five Years though Ten Years, Amount |
43,666
|
|
| Due after Ten Years, Amount |
206,499
|
|
| Debt securities carried at fair value |
294,542
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,327
|
|
| Due in One Year or Less, Yield |
1.81%
|
|
| Due after One Year through Five Years, Amount |
$ 6,927
|
|
| Due after One Year through Five Years, Yield |
1.88%
|
|
| Due after Five Years though Ten Years, Amount |
$ 9,132
|
|
| Due after Five Years though Ten Years, Yield |
1.79%
|
|
| Due after Ten Years, Amount |
$ 3,155
|
|
| Due after Ten Years, Yield |
1.84%
|
|
| Total, Amount |
$ 20,541
|
|
| Total, Yield |
1.83%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,326
|
|
| Due after One Year through Five Years, Amount |
6,934
|
|
| Due after Five Years though Ten Years, Amount |
9,162
|
|
| Due after Ten Years, Amount |
3,153
|
|
| Debt securities carried at fair value |
20,575
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,687
|
|
| Due in One Year or Less, Yield |
1.25%
|
|
| Due after One Year through Five Years, Amount |
$ 35,464
|
|
| Due after One Year through Five Years, Yield |
1.59%
|
|
| Due after Five Years though Ten Years, Amount |
$ 53,424
|
|
| Due after Five Years though Ten Years, Yield |
2.11%
|
|
| Due after Ten Years, Amount |
$ 210,369
|
|
| Due after Ten Years, Yield |
3.35%
|
|
| Total, Amount |
$ 316,944
|
|
| Total, Yield |
2.82%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,687
|
|
| Due after One Year through Five Years, Amount |
34,950
|
|
| Due after Five Years though Ten Years, Amount |
52,828
|
|
| Due after Ten Years, Amount |
209,652
|
|
| Debt securities carried at fair value |
$ 315,117
|
|