Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Securities borrowed	$ 24,723	$ 19,575
Derivative instruments, net	3,632	5,189
Bank-owned life insurance	3,366	3,323
Investments in joint ventures and other unconsolidated entities	2,597	2,882
Collateral, net	1,231	1,354
Accounts receivable	1,018	343
Right-of-use assets	876
Receivable for securities settlement	811	531
Prepaid expenses	549	493
Income taxes receivable	169	129
Deferred tax assets, net of valuation allowance	101	113
Deposits with clearing organizations	58	58
Other	514	414
Total	$ 39,645	$ 34,404