Other Assets - Components of Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Other Assets [Line Items]
Total	$ 36,505	$ 32,600
Real estate acquired through foreclosure	0	62
Reported Amount | Other Assets
Other Assets [Line Items]
Collateral deposits, net	23,041	18,134
Unrealized gains on derivative financial instruments, net	5,387	7,934
Bank-owned life insurance	3,057	2,402
Investments in joint ventures and other unconsolidated entities	2,047	1,798
Accounts receivable	1,225	513
Receivable for securities settlement	414	218
Prepaid expenses	309	259
Income taxes receivable	199	396
Deferred tax assets, net of valuation allowance	187	214
Deposits with clearing organizations	135	197
Other	504	535
Total	$ 36,505	$ 32,600