Deposits - Maturities of Interest-Bearing Time Deposits (Details) $ in Millions	Dec. 31, 2016 USD ($)
Maturities of interest bearing time deposits
2017	$ 86,377
2018	4,609
2019	2,134
2020	2,044
2021	4,176
After 5 years	3,889
Total	103,229
U.S.
Maturities of interest bearing time deposits
2017	31,531
2018	4,433
2019	2,066
2020	2,005
2021	3,988
After 5 years	3,889
Total	47,912
Non-U.S.
Maturities of interest bearing time deposits
2017	54,846
2018	176
2019	68
2020	39
2021	188
After 5 years	0
Total	$ 55,317