Interest Income and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Loans	$ 36,634	$ 33,134	$ 32,218
Taxable securities	5,538	6,550	7,617
Non-taxable securities	1,766	1,706	1,423
Total securities	7,304	8,256	9,040
Trading assets	7,292	6,621	7,312
Federal funds sold and securities purchased under resale agreements	2,265	1,592	1,642
Securities borrowed	(332)	(532)	(501)
Deposits with banks	1,863	1,250	1,157
Other assets	875	652	663
Total interest income	55,901	50,973	51,531
Interest expense
Interest bearing deposits	1,356	1,252	1,633
Federal funds purchased and securities loaned or sold under repurchase agreements	1,089	609	604
Commercial paper	135	110	134
Trading liabilities - debt, short-term and other liabilities	1,170	622	712
Long-term debt	5,564	4,435	4,409
Beneficial interest issued by consolidated VIEs	504	435	405
Total interest expense	9,818	7,463	7,897
Net interest income	46,083	43,510	43,634
Provision for credit losses	5,361	3,827	3,139
Net interest income after provision for credit losses	$ 40,722	$ 39,683	$ 40,495