Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other Assets [Abstract]
Receivable - securities lending	$ 22,531	$ 21,204
Derivative instruments, net	4,128	7,321
Bank-owned life insurance	3,197	3,158
Investments in joint ventures and other unconsolidated entities	2,115	2,363
Collateral, net	726	2,236
Accounts receivable	719	886
Prepaid expenses	475	333
Receivable for securities settlement	420	40
Income taxes receivable	221	106
Deferred tax assets, net of valuation allowance	211	210
Deposits with clearing organizations	117	132
Other	431	339
Total	$ 35,291	$ 38,328