Interest Income and Interest Expense (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income
Loans		$ 12,726	$ 11,634	$ 25,606	$ 22,708
Taxable securities		1,875	1,383	3,580	2,696
Non-taxable securities		340	395	703	805
Total investment securities		2,215	1,778	4,283	3,501
Trading assets - debt instruments		2,915	2,111	5,684	4,214
Federal funds sold and securities purchased under resale agreements		1,676	807	3,323	1,538
Securities borrowed		467	190	864	301
Deposits with banks		1,132	1,543	2,302	2,864
All other interest-earning assets		472	503	930	934
Total interest income	[1]	21,603	18,566	42,992	36,060
Interest expense
Interest-bearing deposits		2,413	1,340	4,601	2,400
Federal funds purchased and securities loaned or sold under repurchase agreements		1,226	759	2,336	1,337
Short-term borrowings		363	260	790	469
Trading liabilities – debt and all other interest-bearing liabilities		762	598	1,481	1,057
Long-term debt		2,266	2,003	4,608	3,756
Beneficial interest issued by consolidated VIEs		175	121	325	244
Total interest expense	[1]	7,205	5,081	14,141	9,263
Net interest income		14,398	13,485	28,851	26,797
Provision for credit losses		1,149	1,210	2,644	2,375
Net interest income after provision for credit losses		$ 13,249	$ 12,275	$ 26,207	$ 24,422

[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. For additional information, refer to Note 6.