Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Other Assets [Abstract]
Securities borrowed	$ 23,929	$ 19,575
Derivative instruments, net	4,178	5,189
Bank-owned life insurance	3,345	3,323
Investments in joint ventures and other unconsolidated entities	2,668	2,882
Receivable for securities settlement	969	531
Collateral, net	903	1,354
Right-of-use assets	899
Accounts receivable	760	343
Prepaid expenses	520	493
Income taxes receivable	100	129
Deferred tax assets, net of valuation allowance	100	113
Deposits with clearing organizations	58	58
Other	470	414
Total	$ 38,899	$ 34,404