Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Other Assets [Abstract]
Securities Financing pledged assets and collateral received	$ 23,727	$ 19,404
Derivative instruments, net	4,727	4,013
Bank-owned life insurance	3,300	3,242
Investments in joint ventures and other unconsolidated entities(2)	2,797	2,259
Collateral, net	1,268	473
Receivable for securities settlement	749	188
Prepaid expenses	510	364
Accounts receivable	361	348
Deposits with clearing organizations	126	120
Deferred tax assets, net of valuation allowance	120	113
Income taxes receivable	61	97
Other	455	397
Total	$ 38,201	$ 31,018