Other Non-Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Collections	$ 322	$ 372	$ 470
Fraud losses	316	275	218
Bankcard, regulatory, and other fee assessments	444	465	562
Other	761	623	794
Total other non-interest expense	$ 1,843	$ 1,735	$ 2,044