Offsetting Arrangements - Liabilities With Offsetting Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	$ 15,926	$ 15,381
Derivatives, Gross amounts offset in statement of condition	(10,847)	(8,922)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	5,079	6,459
Derivative, Net Amount	4,508	5,902
Derivative liability, collateral, cash offset	(1,546)	(837)
Derivatives, Cash and collateral securities netting, Cash and Securities Provided	(571)	(557)
Derivatives, Cash and collateral securities netting, Net	(2,117)	(1,394)
Resale agreements and securities lending, Gross Amounts of Recognized Liabilities(1)(2)	89,465	171,853
Resale agreements and securities lending, Gross Amounts Offset in Statement of Condition(3)	(79,951)	(159,977)
Resale agreements and securities lending, Net Amounts of Liabilities Presented in Statement of Condition	9,514	11,876
Resale agreements and securities lending, Cash and Securities Provided	(8,036)	(10,793)
Resale agreements and securities lending, Net Amount	1,478	1,083
Total derivatives and other financial instruments, Gross Amounts of Recognized Liabilities	105,391	187,234
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(90,798)	(168,899)
Total derivatives and other financial instruments, Net Amounts of Liabilities Presented in Statement of Condition	14,593	18,335
Total derivatives and other financial instruments, Cash and Securities Provided	(8,607)	(11,350)
Total derivatives and other financial instruments, Net Amount	5,986	6,985
Securities sold under repurchase agreements	3,513	1,102
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	15,685	15,150
Derivatives, Gross amounts offset in statement of condition	(9,285)	(8,081)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	6,400	7,069
Derivative, Net Amount	6,400	7,069
Interest rate contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	56	49
Derivatives, Gross amounts offset in statement of condition	(16)	(4)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	40	45
Derivative, Net Amount	40	45
Other derivative contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	185	182
Derivatives, Gross amounts offset in statement of condition	0	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	185	182
Derivative, Net Amount	185	182
Accrued expenses and other liabilities
Offsetting Liabilities [Line Items]
Cash collateral received in connection to securities finance activities	$ 6,000	$ 10,770