Offsetting Arrangements - Assets With Offsetting Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	$ 19,953	$ 19,707
Derivatives, gross amounts offset in statement of condition	(15,598)	(14,400)
Derivatives, net amounts of assets presented in statement of condition	4,355	5,307
Derivatives, net amount	3,475	4,238
Derivatives, cash collateral and securities netting, cash offset	(3,597)	(3,904)
Derivatives, cash collateral and securities netting, cash and securities received	(880)	(1,069)
Derivatives, cash collateral and securities netting, net amount	(4,477)	(4,973)
Resale agreements and securities borrowing, gross amounts of recognized assets	272,387	230,384
Resale agreements and securities borrowing, gross amounts offset in statement of condition	(228,907)	(200,561)
Resale agreements and securities borrowing, net amounts of assets presented in statement of condition	43,480	29,823
Resale agreements and securities borrowing, cash and securities received	(40,496)	(28,016)
Resale agreements and securities borrowing, net amount	2,984	1,807
Total derivatives and other financial instruments, gross amounts of recognized assets	292,340	250,091
Total derivatives and other financial instruments, gross amounts offset in statement of condition	(244,505)	(214,961)
Total derivatives and other financial instruments, net amounts of assets presented in statement of condition	47,835	35,130
Total derivatives and other financial instruments, cash and securities received	(41,376)	(29,085)
Total derivatives and other financial instruments, net amount	6,459	6,045
Securities purchased under resale agreements	8,334	6,692
Cash collateral provided for securities borrowing		23,130
Resale agreements	8,330
Collateral provided	35,150
Foreign exchange contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	19,900	19,694
Derivatives, gross amounts offset in statement of condition	(12,000)	(10,496)
Derivatives, net amounts of assets presented in statement of condition	7,900	9,198
Derivatives, net amount	7,900	9,198
Interest rate contracts
Offsetting Assets [Line Items]
Derivatives, gross amounts of recognized assets	53	13
Derivatives, gross amounts offset in statement of condition	(1)	0
Derivatives, net amounts of assets presented in statement of condition	52	13
Derivatives, net amount	$ 52	$ 13