Variable Interest Entities and Securitization Activities - Assets and Liabilities by Balance Sheet Caption (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Assets
Cash and due from banks	$ 38,257	$ 30,541	$ 30,176
Restricted cash	30,435	35,356	$ 32,706
Trading assets at fair value	286,965	266,299
Customer and other receivables	53,381	53,298
Goodwill	7,158	6,688
Intangible assets	2,276	2,163
Other assets	19,654	15,641
Total assets	891,959	853,531
Liabilities
Other secured financings	8,476	5,245
Other liabilities and accrued expenses	18,570	17,204
Total liabilities	809,114	772,125
Noncontrolling interests	1,121	1,160
Consolidated VIEs
Assets
Cash and due from banks	103	77
Restricted cash	172	171
Trading assets at fair value	643	314
Customer and other receivables	11	25
Goodwill	18	18
Intangible assets	99	128
Other assets	415	402
Total assets	1,461	1,135
Liabilities
Other secured financings	44	64
Other liabilities and accrued expenses	32	22
Total liabilities	76	86
Noncontrolling interests	$ 131	$ 106