Other Noninterest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Advertising and public relations	$ 38	$ 39	$ 61
Communications	39	40	45
Other	285	204	198
Total other noninterest expense	$ 362	$ 283	$ 304