Deposits - Time Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Time Deposits [Line Items]
Total	$ 81,429	$ 112,610
U.S. offices
Time Deposits [Line Items]
Total	26,180	64,519
Non-U.S. offices
Time Deposits [Line Items]
Total	$ 55,249	$ 48,091