Noninterest expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Non interest Expense [Line Items]
Federal Deposit Insurance Corporation-related (“FDIC”) expense	$ 298	$ 250	$ 916	$ 809
Threatened or Pending Litigation
Non interest Expense [Line Items]
Firmwide legal expense	$ 1,347	$ 1,062	$ 2,325	$ 1,769