Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Jun. 30, 2017 |
Dec. 31, 2016 |
| Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [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 |
$ 22
|
|
| Due after One Year through Five Years, Yield |
3.79%
|
|
| Due after Five Years through Ten Years, Amount |
$ 928
|
|
| Due after Five Years though Ten Years, Yield |
2.39%
|
|
| Due after Ten Years, Amount |
$ 118,058
|
|
| Due after Ten Years, Yield |
3.02%
|
|
| Amortized Cost |
$ 119,008
|
$ 117,071
|
| Total, Yield |
3.02%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 315,509
|
313,660
|
| Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Due in One Year or Less, Amount |
0
|
|
| Due after One Year through Five Years, Amount |
22
|
|
| Due after Five Years though Ten Years, Amount |
901
|
|
| Due after Ten Years, Amount |
116,407
|
|
| Held-to-maturity Securities, Fair Value |
117,330
|
$ 115,285
|
| Agency |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 3
|
|
| Due in One Year or Less, Yield |
4.67%
|
|
| Due after One Year through Five Years, Amount |
$ 42
|
|
| Due after One Year through Five Years, Yield |
3.73%
|
|
| Due after Five Years though Ten Years, Amount |
$ 641
|
|
| Due after Five Years though Ten Years, Yield |
2.57%
|
|
| Due after Ten Years, Amount |
$ 192,536
|
|
| Due after Ten Years, Yield |
3.23%
|
|
| Total, Amount |
$ 193,222
|
|
| Total, Yield |
3.23%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 3
|
|
| Due after One Year through Five Years, Amount |
43
|
|
| Due after Five Years though Ten Years, Amount |
646
|
|
| Due after Ten Years, Amount |
191,482
|
|
| Debt securities carried at fair value |
192,174
|
|
| 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 |
$ 0
|
|
| Due after Five Years though Ten Years, Yield |
0.00%
|
|
| Due after Ten Years, Amount |
$ 7,445
|
|
| Due after Ten Years, Yield |
3.18%
|
|
| Total, Amount |
$ 7,445
|
|
| 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 |
0
|
|
| Due after Ten Years, Amount |
7,489
|
|
| Debt securities carried at fair value |
7,489
|
|
| Commercial |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 48
|
|
| Due in One Year or Less, Yield |
7.64%
|
|
| Due after One Year through Five Years, Amount |
$ 485
|
|
| Due after One Year through Five Years, Yield |
1.90%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,529
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 512
|
|
| Due after Ten Years, Yield |
2.71%
|
|
| Total, Amount |
$ 12,574
|
|
| Total, Yield |
2.45%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 48
|
|
| Due after One Year through Five Years, Amount |
486
|
|
| Due after Five Years though Ten Years, Amount |
11,407
|
|
| Due after Ten Years, Amount |
500
|
|
| Debt securities carried at fair value |
12,441
|
|
| 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 |
$ 28
|
|
| Due after Five Years though Ten Years, Yield |
0.01%
|
|
| Due after Ten Years, Amount |
$ 4,527
|
|
| Due after Ten Years, Yield |
8.75%
|
|
| Total, Amount |
$ 4,555
|
|
| Total, Yield |
8.70%
|
|
| 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 |
37
|
|
| Due after Ten Years, Amount |
4,914
|
|
| Debt securities carried at fair value |
4,951
|
|
| Mortgage-backed securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 51
|
|
| Due in One Year or Less, Yield |
7.47%
|
|
| Due after One Year through Five Years, Amount |
$ 527
|
|
| Due after One Year through Five Years, Yield |
2.05%
|
|
| Due after Five Years though Ten Years, Amount |
$ 12,198
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 205,020
|
|
| Due after Ten Years, Yield |
3.35%
|
|
| Total, Amount |
$ 217,796
|
|
| Total, Yield |
3.30%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 51
|
|
| Due after One Year through Five Years, Amount |
529
|
|
| Due after Five Years though Ten Years, Amount |
12,090
|
|
| Due after Ten Years, Amount |
204,385
|
|
| Debt securities carried at fair value |
217,055
|
|
| 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 |
$ 718
|
|
| Due in One Year or Less, Yield |
0.64%
|
|
| Due after One Year through Five Years, Amount |
$ 25,714
|
|
| Due after One Year through Five Years, Yield |
1.51%
|
|
| Due after Five Years though Ten Years, Amount |
$ 25,404
|
|
| Due after Five Years though Ten Years, Yield |
1.88%
|
|
| Due after Ten Years, Amount |
$ 67
|
|
| Due after Ten Years, Yield |
5.09%
|
|
| Total, Amount |
$ 51,903
|
|
| Total, Yield |
1.69%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 719
|
|
| Due after One Year through Five Years, Amount |
25,537
|
|
| Due after Five Years though Ten Years, Amount |
25,097
|
|
| Due after Ten Years, Amount |
70
|
|
| Debt securities carried at fair value |
51,423
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,221
|
|
| Due in One Year or Less, Yield |
0.48%
|
|
| Due after One Year through Five Years, Amount |
$ 1,755
|
|
| Due after One Year through Five Years, Yield |
1.36%
|
|
| Due after Five Years though Ten Years, Amount |
$ 88
|
|
| Due after Five Years though Ten Years, Yield |
1.17%
|
|
| Due after Ten Years, Amount |
$ 194
|
|
| Due after Ten Years, Yield |
6.65%
|
|
| Total, Amount |
$ 19,258
|
|
| Total, Yield |
0.62%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,218
|
|
| Due after One Year through Five Years, Amount |
1,703
|
|
| Due after Five Years though Ten Years, Amount |
146
|
|
| Due after Ten Years, Amount |
200
|
|
| Debt securities carried at fair value |
19,267
|
|
| 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 |
$ 2,447
|
|
| Due in One Year or Less, Yield |
2.37%
|
|
| Due after One Year through Five Years, Amount |
$ 4,008
|
|
| Due after One Year through Five Years, Yield |
2.37%
|
|
| Due after Five Years though Ten Years, Amount |
$ 1,514
|
|
| Due after Five Years though Ten Years, Yield |
3.00%
|
|
| Due after Ten Years, Amount |
$ 1,229
|
|
| Due after Ten Years, Yield |
3.26%
|
|
| Total, Amount |
$ 9,198
|
|
| Total, Yield |
2.59%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 2,449
|
|
| Due after One Year through Five Years, Amount |
3,998
|
|
| Due after Five Years though Ten Years, Amount |
1,538
|
|
| Due after Ten Years, Amount |
1,302
|
|
| Debt securities carried at fair value |
9,287
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,437
|
|
| Due in One Year or Less, Yield |
0.73%
|
|
| Due after One Year through Five Years, Amount |
$ 32,004
|
|
| Due after One Year through Five Years, Yield |
1.62%
|
|
| Due after Five Years though Ten Years, Amount |
$ 39,204
|
|
| Due after Five Years though Ten Years, Yield |
2.10%
|
|
| Due after Ten Years, Amount |
$ 206,510
|
|
| Due after Ten Years, Yield |
3.35%
|
|
| Total, Amount |
$ 298,155
|
|
| Total, Yield |
2.82%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,437
|
|
| Due after One Year through Five Years, Amount |
31,767
|
|
| Due after Five Years though Ten Years, Amount |
38,871
|
|
| Due after Ten Years, Amount |
205,957
|
|
| Debt securities carried at fair value |
297,032
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 536
|
|
| Due in One Year or Less, Yield |
1.75%
|
|
| Due after One Year through Five Years, Amount |
$ 6,577
|
|
| Due after One Year through Five Years, Yield |
1.81%
|
|
| Due after Five Years though Ten Years, Amount |
$ 9,076
|
|
| Due after Five Years though Ten Years, Yield |
1.70%
|
|
| Due after Ten Years, Amount |
$ 2,287
|
|
| Due after Ten Years, Yield |
1.83%
|
|
| Total, Amount |
$ 18,476
|
|
| Total, Yield |
1.76%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 536
|
|
| Due after One Year through Five Years, Amount |
6,587
|
|
| Due after Five Years though Ten Years, Amount |
9,069
|
|
| Due after Ten Years, Amount |
2,285
|
|
| Debt securities carried at fair value |
18,477
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,973
|
|
| Due in One Year or Less, Yield |
0.75%
|
|
| Due after One Year through Five Years, Amount |
$ 38,581
|
|
| Due after One Year through Five Years, Yield |
1.65%
|
|
| Due after Five Years though Ten Years, Amount |
$ 48,280
|
|
| Due after Five Years though Ten Years, Yield |
2.02%
|
|
| Due after Ten Years, Amount |
$ 208,797
|
|
| Due after Ten Years, Yield |
3.34%
|
|
| Total, Amount |
$ 316,631
|
|
| Total, Yield |
2.76%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,973
|
|
| Due after One Year through Five Years, Amount |
38,354
|
|
| Due after Five Years though Ten Years, Amount |
47,940
|
|
| Due after Ten Years, Amount |
208,242
|
|
| Debt securities carried at fair value |
$ 315,509
|
|