Deposits - Maturities of Interest-Bearing Time Deposits (Details) $ in Millions	Dec. 31, 2018 USD ($)
Maturities of interest bearing time deposits
2019	$ 72,016
2020	6,538
2021	5,254
2022	3,057
2023	2,091
After 5 years	5,538
Total	94,494
U.S.
Maturities of interest bearing time deposits
2019	31,757
2020	6,309
2021	5,235
2022	2,884
2023	1,719
After 5 years	3,515
Total	51,419
Non-U.S.
Maturities of interest bearing time deposits
2019	40,259
2020	229
2021	19
2022	173
2023	372
After 5 years	2,023
Total	$ 43,075