Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Securities borrowed	$ 22,669	$ 19,575
Derivative instruments, net	5,040	5,189
Bank-owned life insurance	3,388	3,323
Investments in joint ventures and other unconsolidated entities	3,064	2,882
Accounts receivable	889	308
Right-of-use assets	834
Collateral, net	707	1,354
Prepaid expenses	430	493
Receivable for securities settlement	429	531
Income taxes receivable	119	129
Deferred tax assets, net of valuation allowance	95	113
Deposits with clearing organizations	58	58
Other	1,127	834
Total	$ 38,849	$ 34,789