Interest Income and Interest Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income
Loans		$ 50,375	$ 47,620	$ 41,008
Taxable securities		7,962	5,653	5,534
Non-taxable securities		1,329	1,595	1,848
Total investment securities		9,291	7,248	7,382
Trading assets - debt instruments		10,800	8,703	7,610
Federal funds sold and securities purchased under resale agreements		6,146	3,819	2,327
Securities borrowed		1,574	913	94
Deposits with banks		3,887	5,907	4,238
All other interest-earning assets		1,967	1,890	1,312
Total interest income	[1]	84,040	76,100	63,971
Interest expense
Interest bearing deposits		8,957	5,973	2,857
Federal funds purchased and securities loaned or sold under repurchase agreements		4,630	3,066	1,611
Short-term borrowings		1,248	1,144	481
Trading liabilities – debt and all other interest-bearing liabilities		2,585	2,387	1,669
Long-term debt		8,807	7,978	6,753
Beneficial interest issued by consolidated VIEs		568	493	503
Total interest expense	[1]	26,795	21,041	13,874
Net interest income		57,245	55,059	50,097
Provision for credit losses		5,585	4,871	5,290
Net interest income after provision for credit losses		$ 51,660	$ 50,188	$ 44,807

[1] In the second quarter of 2019, the Firm implemented certain presentation changes that impacted interest income and interest expense, but had no effect on net interest income. These changes were applied retrospectively and, accordingly, prior period amounts were revised to conform with the current presentation. Refer to Note 7 for additional information.