Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions |
Sep. 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 |
$ 35
|
|
| Due after One Year through Five Years, Yield |
3.66%
|
|
| Due after Five Years through Ten Years, Amount |
$ 1,074
|
|
| Due after Five Years though Ten Years, Yield |
2.56%
|
|
| Due after Ten Years, Amount |
$ 121,236
|
|
| Due after Ten Years, Yield |
3.03%
|
|
| Amortized Cost |
$ 122,345
|
$ 117,071
|
| Total, Yield |
3.03%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Debt securities carried at fair value |
$ 316,864
|
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 |
27
|
|
| Due after Five Years though Ten Years, Amount |
896
|
|
| Due after Ten Years, Amount |
120,262
|
|
| Held-to-maturity Securities, Fair Value |
121,185
|
$ 115,285
|
| Agency |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 6
|
|
| Due in One Year or Less, Yield |
4.67%
|
|
| Due after One Year through Five Years, Amount |
$ 25
|
|
| Due after One Year through Five Years, Yield |
3.38%
|
|
| Due after Five Years though Ten Years, Amount |
$ 593
|
|
| Due after Five Years though Ten Years, Yield |
2.56%
|
|
| Due after Ten Years, Amount |
$ 195,906
|
|
| Due after Ten Years, Yield |
3.23%
|
|
| Total, Amount |
$ 196,530
|
|
| Total, Yield |
3.23%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 6
|
|
| Due after One Year through Five Years, Amount |
25
|
|
| Due after Five Years though Ten Years, Amount |
598
|
|
| Due after Ten Years, Amount |
195,565
|
|
| Debt securities carried at fair value |
196,194
|
|
| 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 |
$ 34
|
|
| Due after Five Years though Ten Years, Yield |
2.50%
|
|
| Due after Ten Years, Amount |
$ 6,991
|
|
| Due after Ten Years, Yield |
3.18%
|
|
| Total, Amount |
$ 7,025
|
|
| 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 |
33
|
|
| Due after Ten Years, Amount |
7,021
|
|
| Debt securities carried at fair value |
7,054
|
|
| 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 |
8.11%
|
|
| Due after One Year through Five Years, Amount |
$ 847
|
|
| Due after One Year through Five Years, Yield |
2.06%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,183
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 506
|
|
| Due after Ten Years, Yield |
2.70%
|
|
| Total, Amount |
$ 12,584
|
|
| 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 |
848
|
|
| Due after Five Years though Ten Years, Amount |
11,072
|
|
| Due after Ten Years, Amount |
496
|
|
| Debt securities carried at fair value |
12,464
|
|
| 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 |
$ 26
|
|
| Due after Five Years though Ten Years, Yield |
0.01%
|
|
| Due after Ten Years, Amount |
$ 5,106
|
|
| Due after Ten Years, Yield |
9.05%
|
|
| Total, Amount |
$ 5,132
|
|
| Total, Yield |
9.00%
|
|
| 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 |
35
|
|
| Due after Ten Years, Amount |
5,680
|
|
| Debt securities carried at fair value |
5,715
|
|
| Mortgage-backed securities |
|
|
| 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 |
7.73%
|
|
| Due after One Year through Five Years, Amount |
$ 872
|
|
| Due after One Year through Five Years, Yield |
2.10%
|
|
| Due after Five Years though Ten Years, Amount |
$ 11,836
|
|
| Due after Five Years though Ten Years, Yield |
2.44%
|
|
| Due after Ten Years, Amount |
$ 208,509
|
|
| Due after Ten Years, Yield |
3.37%
|
|
| Total, Amount |
$ 221,271
|
|
| Total, Yield |
3.32%
|
|
| 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 |
873
|
|
| Due after Five Years though Ten Years, Amount |
11,738
|
|
| Due after Ten Years, Amount |
208,762
|
|
| Debt securities carried at fair value |
221,427
|
|
| 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 |
$ 516
|
|
| Due in One Year or Less, Yield |
0.39%
|
|
| Due after One Year through Five Years, Amount |
$ 21,254
|
|
| Due after One Year through Five Years, Yield |
1.40%
|
|
| Due after Five Years though Ten Years, Amount |
$ 29,033
|
|
| Due after Five Years though Ten Years, Yield |
1.96%
|
|
| Due after Ten Years, Amount |
$ 21
|
|
| Due after Ten Years, Yield |
2.42%
|
|
| Total, Amount |
$ 50,824
|
|
| Total, Yield |
1.71%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 516
|
|
| Due after One Year through Five Years, Amount |
20,992
|
|
| Due after Five Years though Ten Years, Amount |
28,739
|
|
| Due after Ten Years, Amount |
21
|
|
| Debt securities carried at fair value |
50,268
|
|
| Non-U.S. securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,563
|
|
| Due in One Year or Less, Yield |
0.50%
|
|
| Due after One Year through Five Years, Amount |
$ 1,839
|
|
| Due after One Year through Five Years, Yield |
1.24%
|
|
| Due after Five Years though Ten Years, Amount |
$ 110
|
|
| Due after Five Years though Ten Years, Yield |
1.34%
|
|
| Due after Ten Years, Amount |
$ 177
|
|
| Due after Ten Years, Yield |
6.52%
|
|
| Total, Amount |
$ 18,689
|
|
| Total, Yield |
0.63%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 16,563
|
|
| Due after One Year through Five Years, Amount |
1,844
|
|
| Due after Five Years though Ten Years, Amount |
111
|
|
| Due after Ten Years, Amount |
182
|
|
| Debt securities carried at fair value |
18,700
|
|
| 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 |
$ 1,747
|
|
| Due in One Year or Less, Yield |
2.28%
|
|
| Due after One Year through Five Years, Amount |
$ 2,865
|
|
| Due after One Year through Five Years, Yield |
2.59%
|
|
| Due after Five Years though Ten Years, Amount |
$ 1,418
|
|
| Due after Five Years though Ten Years, Yield |
2.95%
|
|
| Due after Ten Years, Amount |
$ 1,151
|
|
| Due after Ten Years, Yield |
3.28%
|
|
| Total, Amount |
$ 7,181
|
|
| Total, Yield |
2.70%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,747
|
|
| Due after One Year through Five Years, Amount |
2,845
|
|
| Due after Five Years though Ten Years, Amount |
1,450
|
|
| Due after Ten Years, Amount |
1,235
|
|
| Debt securities carried at fair value |
7,277
|
|
| Total taxable securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 18,880
|
|
| Due in One Year or Less, Yield |
0.68%
|
|
| Due after One Year through Five Years, Amount |
$ 26,830
|
|
| Due after One Year through Five Years, Yield |
1.54%
|
|
| Due after Five Years though Ten Years, Amount |
$ 42,397
|
|
| Due after Five Years though Ten Years, Yield |
2.13%
|
|
| Due after Ten Years, Amount |
$ 209,858
|
|
| Due after Ten Years, Yield |
3.37%
|
|
| Total, Amount |
$ 297,965
|
|
| Total, Yield |
2.86%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 18,880
|
|
| Due after One Year through Five Years, Amount |
26,554
|
|
| Due after Five Years though Ten Years, Amount |
42,038
|
|
| Due after Ten Years, Amount |
210,200
|
|
| Debt securities carried at fair value |
297,672
|
|
| Tax-exempt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,175
|
|
| Due in One Year or Less, Yield |
1.46%
|
|
| Due after One Year through Five Years, Amount |
$ 6,428
|
|
| Due after One Year through Five Years, Yield |
1.77%
|
|
| Due after Five Years though Ten Years, Amount |
$ 9,155
|
|
| Due after Five Years though Ten Years, Yield |
1.66%
|
|
| Due after Ten Years, Amount |
$ 2,359
|
|
| Due after Ten Years, Yield |
2.03%
|
|
| Total, Amount |
$ 19,117
|
|
| Total, Yield |
1.73%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 1,174
|
|
| Due after One Year through Five Years, Amount |
6,451
|
|
| Due after Five Years though Ten Years, Amount |
9,202
|
|
| Due after Ten Years, Amount |
2,365
|
|
| Debt securities carried at fair value |
19,192
|
|
| Debt securities |
|
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,055
|
|
| Due in One Year or Less, Yield |
0.73%
|
|
| Due after One Year through Five Years, Amount |
$ 33,258
|
|
| Due after One Year through Five Years, Yield |
1.58%
|
|
| Due after Five Years though Ten Years, Amount |
$ 51,552
|
|
| Due after Five Years though Ten Years, Yield |
2.04%
|
|
| Due after Ten Years, Amount |
$ 212,217
|
|
| Due after Ten Years, Yield |
3.36%
|
|
| Total, Amount |
$ 317,082
|
|
| Total, Yield |
2.79%
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |
|
|
| Due in One Year or Less, Amount |
$ 20,054
|
|
| Due after One Year through Five Years, Amount |
33,005
|
|
| Due after Five Years though Ten Years, Amount |
51,240
|
|
| Due after Ten Years, Amount |
212,565
|
|
| Debt securities carried at fair value |
$ 316,864
|
|