Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Other Assets [Abstract]
Securities borrowed	$ 24,690	$ 18,330
Derivative instruments, net	7,848	5,804
Bank-owned life insurance	3,525	3,479
Investments in joint ventures and other unconsolidated entities	3,214	3,095
Collateral, net	1,328	2,616
Receivable for securities settlement	1,102	117
Right-of-use assets	622	720
Prepaid expenses	447	383
Income tax receivable	314	367
Accounts receivable	262	379
Deferred tax assets, net of valuation allowance	212	233
Deposits with clearing organizations	62	58
Other Assets	1,846	929
Total	45,472	36,510
Advances	$ 1,411	$ 460