Offsetting Arrangements - Liabilities With Offsetting Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	$ 17,355	$ 26,126
Derivatives, Gross amounts offset in statement of condition	(12,127)	(15,558)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	5,228	10,568
Derivative, Net Amount	3,978	8,836
Derivative liability, collateral, cash offset	(3,869)	(1,287)
Derivatives, Cash and collateral securities netting, Cash and Securities Provided	(1,250)	(1,732)
Derivatives, Cash and collateral securities netting, Net	(5,119)	(3,019)
Resale agreements and securities lending, Gross Amounts of Recognized Liabilities	61,347	165,793
Resale agreements and securities lending, Gross Amounts Offset in Statement of Condition	(53,618)	(153,025)
Resale agreements and securities lending, Net Amounts of Liabilities Presented in Statement of Condition	7,729	12,768
Resale agreements and securities lending, Cash and Securities Provided	(7,100)	(12,448)
Resale agreements and securities lending, Net Amount	629	320
Total derivatives and other financial instruments, Gross Amounts of Recognized Liabilities	78,702	191,919
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(65,745)	(168,583)
Total derivatives and other financial instruments, Net Amounts of Liabilities Presented in Statement of Condition	12,957	23,336
Total derivatives and other financial instruments, Cash and Securities Provided	(8,350)	(14,180)
Total derivatives and other financial instruments, Net Amount	4,607	9,156
Securities sold under repurchase agreements	658	3,413
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	17,141	25,927
Derivatives, Gross amounts offset in statement of condition	(8,257)	(14,271)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	8,884	11,656
Derivative, Net Amount	8,884	11,656
Interest rate contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	31	42
Derivatives, Gross amounts offset in statement of condition	(1)	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	30	42
Derivative, Net Amount	30	42
Other derivative contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	183	157
Derivatives, Gross amounts offset in statement of condition	0	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	183	157
Derivative, Net Amount	183	157
Accrued expenses and other liabilities
Offsetting Liabilities [Line Items]
Cash collateral received in connection to securities finance activities	$ 7,070	$ 9,360