Offsetting Arrangements - Liabilities With Offsetting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	$ 31,804	$ 15,381
Derivatives, Gross amounts offset in statement of condition	(24,018)	(8,922)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	7,786	6,459
Derivative, Net Amount	6,685	5,902
Derivative liability, collateral, cash offset	(5,786)	(837)
Derivatives, Cash and collateral securities netting, Cash and Securities Provided	(1,101)	(557)
Derivatives, Cash and collateral securities netting, Net	(6,887)	(1,394)
Resale agreements and securities lending, Gross Amounts of Recognized Liabilities(1)(2)	181,125	171,853
Resale agreements and securities lending, Gross Amounts Offset in Statement of Condition(3)	(167,693)	(159,977)
Resale agreements and securities lending, Net Amounts of Liabilities Presented in Statement of Condition	13,432	11,876
Resale agreements and securities lending, Cash and Securities Provided	(11,560)	(10,793)
Resale agreements and securities lending, Net Amount	1,872	1,083
Total derivatives and other financial instruments, Gross Amounts of Recognized Liabilities	212,929	187,234
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(191,711)	(168,899)
Total derivatives and other financial instruments, Net Amounts of Liabilities Presented in Statement of Condition	21,218	18,335
Total derivatives and other financial instruments, Cash and Securities Provided	(12,661)	(11,350)
Total derivatives and other financial instruments, Net Amount	8,557	6,985
Securities sold under repurchase agreements	5,373	1,102
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	31,551	15,150
Derivatives, Gross amounts offset in statement of condition	(18,215)	(8,081)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	13,336	7,069
Derivative, Net Amount	13,336	7,069
Interest rate contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	65	49
Derivatives, Gross amounts offset in statement of condition	(17)	(4)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	48	45
Derivative, Net Amount	48	45
Other derivative contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	188	182
Derivatives, Gross amounts offset in statement of condition	0	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	188	182
Derivative, Net Amount	188	182
Accrued expenses and other liabilities
Offsetting Liabilities [Line Items]
Cash collateral received in connection to securities finance activities	$ 8,060	$ 10,770