Investment Securities (Contractual Maturity) (Details) - USD ($)
$ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
| Investment Securities Available-for-Sale, Amortized Cost |
|
|
| Due after one year through five years, amortized cost |
$ 18
|
|
| Due after five years through 10 years, amortized cost |
7
|
|
| Due after 10 years, amortized cost |
1,070
|
|
| Total, amortized cost |
1,095
|
|
| Investment Securities Available-for-Sale, Estimated Fair Value |
|
|
| Due after one year through five years, fair value |
18
|
|
| Due after five years through 10 years, fair value |
7
|
|
| Due after 10 years, fair value |
1,090
|
|
| Fair Value |
$ 1,115
|
$ 1,294
|
| Investment Securities Available-for-Sale, Weighted-Average Yield |
|
|
| Due after one year through five years, weighted average yield (as a percent) |
3.94%
|
|
| Due after five years through 10 years, weighted average yield (as a percent) |
2.64%
|
|
| Due after 10 years, weighted average yield (as a percent) |
2.45%
|
|
| Investment Securities Held-to-maturity, Amortized cost |
|
|
| Due after one year through five years, amortized cost |
$ 0
|
|
| Due after five years through 10 years, amortized cost |
61
|
|
| Due after 10 years, amortized cost |
1,095
|
|
| Amortized Cost |
1,156
|
1,268
|
| Investment Securities Held-to-maturity, Estimated Fair Value |
|
|
| Due after one year through five years, fair value |
0
|
|
| Due after five years through 10 years, fair value |
63
|
|
| Due after 10 years, fair value |
1,114
|
|
| Fair Value |
$ 1,177
|
$ 1,262
|
| Investment Securities Held-to-maturity, Weighted-Average Yield |
|
|
| Due after one year through five years, weighted average yield (as a percent) |
0.00%
|
|
| Due after five years through 10 years, weighted average yield (as a percent) |
2.50%
|
|
| Due after 10 years, weighted average yield (as a percent) |
2.40%
|
|