Noninterest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Non interest Expense [Line Items]
Federal Deposit Insurance Corporation-related (“FDIC”) expense	$ 1,227	$ 1,037	$ 1,496
Threatened or Pending Litigation
Non interest Expense [Line Items]
Legal expense	$ 2,969	$ 2,883	$ 11,143