Interest Income and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans	$ 33,134	$ 32,218	$ 33,489
Taxable securities	6,550	7,617	6,916
Non-taxable securities	1,706	1,423	896
Total securities	8,256	9,040	7,812
Trading assets	6,621	7,312	8,099
Federal funds sold and securities purchased under resale agreements	1,592	1,642	1,940
Securities borrowed	(532)	(501)	(127)
Deposits with banks	1,250	1,157	918
Other assets	652	663	538
Total interest income	50,973	51,531	52,669
Interest expense
Interest bearing deposits	1,252	1,633	2,067
Federal funds purchased and securities loaned or sold under repurchase agreements	609	604	582
Commercial paper	110	134	112
Trading liabilities - debt, short-term and other liabilities	622	712	1,104
Long-term debt	4,435	4,409	5,007
Beneficial interest issued by consolidated VIEs	435	405	478
Total interest expense	7,463	7,897	9,350
Net interest income	43,510	43,634	43,319
Provision for credit losses	3,827	3,139	225
Net interest income after provision for credit losses	$ 39,683	$ 40,495	$ 43,094