Noninterest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Non interest Expense [Line Items]
FDIC related expense	$ 300	$ 266	$ 618	$ 559
Threatened or Pending Litigation
Non interest Expense [Line Items]
Loss contingency, loss in period	$ 291	$ 669	$ 978	$ 707