Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Assets [Abstract]
Receivable - securities lending	$ 23,628	$ 21,204
Derivative instruments, net	4,712	7,321
Bank-owned life insurance	3,219	3,158
Investments in joint ventures and other unconsolidated entities	2,099	2,363
Collateral, net	902	2,236
Accounts receivable	393	886
Prepaid expenses	422	333
Receivable for securities settlement	441	40
Income taxes receivable	368	106
Deferred tax assets, net of valuation allowance	213	210
Deposits with clearing organizations	125	132
Other	435	339
Total	$ 36,957	$ 38,328