Deposits - Time Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Time Deposits [Line Items]
Total	$ 66,780	$ 59,720
U.S. offices
Time Deposits [Line Items]
Total	25,119	30,671
Non-U.S. offices
Time Deposits [Line Items]
Total	$ 41,661	$ 29,049