Other Assets - Components of Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Assets [Line Items]
Total	$ 36,909	$ 32,600
Real estate acquired through foreclosure	64	62
Reported Amount | Other Assets
Other Assets [Line Items]
Collateral deposits, net	23,438	18,134
Unrealized gains on derivative financial instruments, net	5,168	7,934
Bank-owned life insurance	3,037	2,402
Investments in joint ventures and other unconsolidated entities	2,022	1,798
Accounts receivable	836	513
Receivable for securities settlement	757	218
Prepaid expenses	333	259
Income taxes receivable	319	396
Deferred tax assets, net of valuation allowance	192	214
Deposits with clearing organizations	175	197
Other	632	535
Total	$ 36,909	$ 32,600