Other Assets - Components of Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Abstract]
Collateral deposits, net	$ 20,971	$ 21,465
Derivative instruments, net	8,784	4,777
Bank-owned life insurance	3,118	3,078
Investments in joint ventures and other unconsolidated entities	2,262	2,034
Accounts receivable	961	1,018
Receivable for securities settlement	622	311
Prepaid expenses	344	284
Deferred tax assets, net of valuation allowance	225	182
Income taxes receivable	141	154
Deposits with clearing organizations	139	127
Other	422	473
Total	$ 37,989	$ 33,903