Offsetting Arrangements - Liabilities With Offsetting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	$ 22,261	$ 26,126
Derivatives, Gross amounts offset in statement of condition	(15,534)	(15,558)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	6,727	10,568
Derivative, Net Amount	5,075	8,836
Derivative liability, collateral, cash offset	(3,610)	(1,287)
Derivatives, Cash and collateral securities netting, Cash and Securities Provided	(1,652)	(1,732)
Derivatives, Cash and collateral securities netting, Net	(5,262)	(3,019)
Resale agreements and securities lending, Gross Amounts of Recognized Liabilities	128,605	165,793
Resale agreements and securities lending, Gross Amounts Offset in Statement of Condition	(114,220)	(153,025)
Resale agreements and securities lending, Net Amounts of Liabilities Presented in Statement of Condition	14,385	12,768
Resale agreements and securities lending, Cash and Securities Provided	(13,815)	(12,448)
Resale agreements and securities lending, Net Amount	570	320
Total derivatives and other financial instruments, Gross Amounts of Recognized Liabilities	150,866	191,919
Total derivatives and other financial instruments, Gross Amounts Offset in Statement of Condition	(129,754)	(168,583)
Total derivatives and other financial instruments, Net Amounts of Liabilities Presented in Statement of Condition	21,112	23,336
Total derivatives and other financial instruments, Cash and Securities Provided	(15,467)	(14,180)
Total derivatives and other financial instruments, Net Amount	5,645	9,156
Securities sold under repurchase agreements	587	3,413
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	22,045	25,927
Derivatives, Gross amounts offset in statement of condition	(11,923)	(14,271)
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	10,122	11,656
Derivative, Net Amount	10,122	11,656
Interest rate contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	35	42
Derivatives, Gross amounts offset in statement of condition	(1)	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	34	42
Derivative, Net Amount	34	42
Other derivative contracts
Offsetting Liabilities [Line Items]
Derivatives, Gross amounts of recognized liabilities	181	157
Derivatives, Gross amounts offset in statement of condition	0	0
Derivatives, Net Amounts of Liabilities Presented in Statement of Condition	181	157
Derivative, Net Amount	181	157
Accrued expenses and other liabilities
Offsetting Liabilities [Line Items]
Cash collateral received in connection to securities finance activities	$ 13,800	$ 9,360