Interest Income and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income
Loans	$ 47,620	$ 41,008	$ 36,634
Taxable securities	5,653	5,535	5,538
Non-taxable securities	1,595	1,847	1,766
Total investment securities	7,248	7,382	7,304
Trading assets	8,703	7,610	7,292
Federal funds sold and securities purchased under resale agreements	3,819	2,327	2,265
Securities borrowed	728	(37)	(332)
Deposits with banks	5,907	4,238	1,879
All other interest-earning assets	3,417	1,844	859
Total interest income	77,442	64,372	55,901
Interest expense
Interest bearing deposits	5,973	2,857	1,356
Federal funds purchased and securities loaned or sold under repurchase agreements	3,066	1,611	1,089
Short-term borrowings	1,144	481	203
Trading liabilities – debt and all other interest-bearing liabilities	3,729	2,070	1,102
Long-term debt	7,978	6,753	5,564
Beneficial interest issued by consolidated VIEs	493	503	504
Total interest expense	22,383	14,275	9,818
Net interest income	55,059	50,097	46,083
Provision for credit losses	4,871	5,290	5,361
Net interest income after provision for credit losses	$ 50,188	$ 44,807	$ 40,722