Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Securities Financing pledged assets and collateral received	$ 20,957	$ 19,404
Derivative instruments, net	3,952	4,013
Bank-owned life insurance	3,263	3,242
Investments in joint ventures and other unconsolidated entities(2)	2,718	2,259
Collateral, net	929	473
Accounts receivable	554	348
Prepaid expenses	439	364
Receivable for securities settlement	419	188
Deposits with clearing organizations	129	120
Deferred tax assets, net of valuation allowance	107	113
Income taxes receivable	44	97
Other	484	397
Total	$ 33,995	$ 31,018