Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Jun. 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 |
$ 63
|
|
| Due after One Year through Five Years, Yield |
3.56%
|
|
| Due after Five Years through Ten Years, Amount |
$ 1,427
|
|
| Due after Five Years though Ten Years, Yield |
2.78%
|
|
| Due after Ten Years, Amount |
$ 161,519
|
|
| Due after Ten Years, Yield |
3.15%
|
|
| Amortized Cost |
$ 163,013
|
$ 125,013
|
| Total, Yield |
3.15%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 275,256
|
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 |
63
|
|
| Due after Five Years though Ten Years, Amount |
1,363
|
|
| Due after Ten Years, Amount |
156,801
|
|
| Held-to-maturity Securities, Fair Value |
158,231
|
$ 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 |
9.33%
|
|
| Due after One Year through Five Years, Amount |
$ 2,181
|
|
| Due after One Year through Five Years, Yield |
2.24%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,596
|
|
| Due after Five Years though Ten Years, Yield |
2.48%
|
|
| Due after Ten Years, Amount |
$ 173,382
|
|
| Due after Ten Years, Yield |
3.43%
|
|
| Total, Amount |
$ 187,215
|
|
| Total, Yield |
3.36%
|
|
| 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 |
2,134
|
|
| Due after Five Years though Ten Years, Amount |
11,139
|
|
| Due after Ten Years, Amount |
168,375
|
|
| Debt securities carried at fair value |
181,704
|
|
| 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 |
3.50%
|
|
| Due after One Year through Five Years, Amount |
$ 26
|
|
| Due after One Year through Five Years, Yield |
3.98%
|
|
| Due after Five Years though Ten Years, Amount |
$ 492
|
|
| Due after Five Years though Ten Years, Yield |
2.61%
|
|
| Due after Ten Years, Amount |
$ 161,781
|
|
| Due after Ten Years, Yield |
3.26%
|
|
| Total, Amount |
$ 162,301
|
|
| Total, Yield |
3.26%
|
|
| 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 |
26
|
|
| Due after Five Years though Ten Years, Amount |
484
|
|
| Due after Ten Years, Amount |
156,488
|
|
| Debt securities carried at fair value |
157,000
|
|
| 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 |
2.55%
|
|
| Due after Ten Years, Amount |
$ 6,163
|
|
| Due after Ten Years, Yield |
3.17%
|
|
| Total, Amount |
$ 6,194
|
|
| 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 |
30
|
|
| Due after Ten Years, Amount |
6,005
|
|
| Debt securities carried at fair value |
6,035
|
|
| 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 |
$ 2,155
|
|
| Due after One Year through Five Years, Yield |
2.22%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,052
|
|
| Due after Five Years though Ten Years, Yield |
2.48%
|
|
| Due after Ten Years, Amount |
$ 895
|
|
| Due after Ten Years, Yield |
2.81%
|
|
| Total, Amount |
$ 14,156
|
|
| Total, Yield |
2.49%
|
|
| 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 |
2,108
|
|
| Due after Five Years though Ten Years, Amount |
10,592
|
|
| Due after Ten Years, Amount |
846
|
|
| Debt securities carried at fair value |
13,600
|
|
| 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 |
$ 21
|
|
| Due after Five Years though Ten Years, Yield |
0.01%
|
|
| Due after Ten Years, Amount |
$ 4,543
|
|
| Due after Ten Years, Yield |
9.82%
|
|
| Total, Amount |
$ 4,564
|
|
| Total, Yield |
9.77%
|
|
| 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 |
5,036
|
|
| Debt securities carried at fair value |
5,069
|
|
| 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 |
$ 542
|
|
| Due in One Year or Less, Yield |
0.45%
|
|
| Due after One Year through Five Years, Amount |
$ 32,638
|
|
| Due after One Year through Five Years, Yield |
1.47%
|
|
| Due after Five Years though Ten Years, Amount |
$ 21,549
|
|
| Due after Five Years though Ten Years, Yield |
2.24%
|
|
| Due after Ten Years, Amount |
$ 29
|
|
| Due after Ten Years, Yield |
2.70%
|
|
| Total, Amount |
$ 54,758
|
|
| Total, Yield |
1.76%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 542
|
|
| Due after One Year through Five Years, Amount |
31,381
|
|
| Due after Five Years though Ten Years, Amount |
20,783
|
|
| Due after Ten Years, Amount |
28
|
|
| Debt securities carried at fair value |
52,734
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 15,118
|
|
| Due in One Year or Less, Yield |
0.79%
|
|
| Due after One Year through Five Years, Amount |
$ 1,787
|
|
| Due after One Year through Five Years, Yield |
1.53%
|
|
| Due after Five Years though Ten Years, Amount |
$ 2
|
|
| Due after Five Years though Ten Years, Yield |
3.56%
|
|
| Due after Ten Years, Amount |
$ 140
|
|
| Due after Ten Years, Yield |
6.55%
|
|
| Total, Amount |
$ 17,047
|
|
| Total, Yield |
0.91%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 15,121
|
|
| Due after One Year through Five Years, Amount |
1,798
|
|
| Due after Five Years though Ten Years, Amount |
2
|
|
| Due after Ten Years, Amount |
144
|
|
| Debt securities carried at fair value |
17,065
|
|
| 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 |
$ 576
|
|
| Due in One Year or Less, Yield |
3.39%
|
|
| Due after One Year through Five Years, Amount |
$ 2,886
|
|
| Due after One Year through Five Years, Yield |
3.34%
|
|
| Due after Five Years though Ten Years, Amount |
$ 874
|
|
| Due after Five Years though Ten Years, Yield |
3.24%
|
|
| Due after Ten Years, Amount |
$ 260
|
|
| Due after Ten Years, Yield |
8.56%
|
|
| Total, Amount |
$ 4,596
|
|
| Total, Yield |
3.62%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 571
|
|
| Due after One Year through Five Years, Amount |
2,905
|
|
| Due after Five Years though Ten Years, Amount |
916
|
|
| Due after Ten Years, Amount |
296
|
|
| Debt securities carried at fair value |
4,688
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,292
|
|
| Due in One Year or Less, Yield |
0.90%
|
|
| Due after One Year through Five Years, Amount |
$ 39,492
|
|
| Due after One Year through Five Years, Yield |
1.65%
|
|
| Due after Five Years though Ten Years, Amount |
$ 34,021
|
|
| Due after Five Years though Ten Years, Yield |
2.35%
|
|
| Due after Ten Years, Amount |
$ 173,811
|
|
| Due after Ten Years, Yield |
3.44%
|
|
| Total, Amount |
$ 263,616
|
|
| Total, Yield |
2.87%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,290
|
|
| Due after One Year through Five Years, Amount |
38,218
|
|
| Due after Five Years though Ten Years, Amount |
32,840
|
|
| Due after Ten Years, Amount |
168,843
|
|
| Debt securities carried at fair value |
256,191
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 894
|
|
| Due in One Year or Less, Yield |
1.71%
|
|
| Due after One Year through Five Years, Amount |
$ 8,332
|
|
| Due after One Year through Five Years, Yield |
2.27%
|
|
| Due after Five Years though Ten Years, Amount |
$ 7,252
|
|
| Due after Five Years though Ten Years, Yield |
2.22%
|
|
| Due after Ten Years, Amount |
$ 2,607
|
|
| Due after Ten Years, Yield |
2.64%
|
|
| Total, Amount |
$ 19,085
|
|
| Total, Yield |
2.28%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 894
|
|
| Due after One Year through Five Years, Amount |
8,347
|
|
| Due after Five Years though Ten Years, Amount |
7,230
|
|
| Due after Ten Years, Amount |
2,594
|
|
| Debt securities carried at fair value |
19,065
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,186
|
|
| Due in One Year or Less, Yield |
0.94%
|
|
| Due after One Year through Five Years, Amount |
$ 47,824
|
|
| Due after One Year through Five Years, Yield |
1.76%
|
|
| Due after Five Years though Ten Years, Amount |
$ 41,273
|
|
| Due after Five Years though Ten Years, Yield |
2.32%
|
|
| Due after Ten Years, Amount |
$ 176,418
|
|
| Due after Ten Years, Yield |
3.42%
|
|
| Total, Amount |
$ 282,701
|
|
| Total, Yield |
2.83%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 17,184
|
|
| Due after One Year through Five Years, Amount |
46,565
|
|
| Due after Five Years though Ten Years, Amount |
40,070
|
|
| Due after Ten Years, Amount |
171,437
|
|
| Debt securities carried at fair value |
$ 275,256
|
|