Pledged Assets, Offsetting - Securities Financing Activities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net amounts in consolidated balance sheet	$ 90,622	$ 89,066
Collateral received with the right to sell or repledge	128,200	124,400
Resale, Securities Borrowing and Similar Arrangements
Gross amounts recognized	105,614	103,140
Gross amounts offset in consolidated balance sheet	(14,992)	(14,074)
Net amounts in consolidated balance sheet	90,622	89,066
Collateral not recognized in consolidated balance sheet	(89,845)	(88,330)
Net amount	777	736
Repurchase and securities lending agreements
Gross amounts recognized	34,752	35,043
Gross amounts offset in consolidated balance sheet	(14,992)	(14,074)
Net amounts in consolidated balance sheet	19,760	20,969
Collateral pledged but not netted in consolidated balance sheet	(19,555)	(20,820)
Net amount	205	149
Collateral sold or repledged	26,300	28,800
Collateral pledged, fair value	35,700	35,900
Fed funds sold and securities purchased under resale agreements [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net amounts in consolidated balance sheet	67,700	66,200
Resale, Securities Borrowing and Similar Arrangements
Net amounts in consolidated balance sheet	67,700	66,200
Loans [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net amounts in consolidated balance sheet	22,900	22,900
Resale, Securities Borrowing and Similar Arrangements
Net amounts in consolidated balance sheet	$ 22,900	$ 22,900