Securities Financing Activities, Contractual Maturities of Gross Obligations (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 415,997	$ 322,482
Securities lending agreements	10,143	7,558
Overnight/Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	250,761	200,118
Securities lending agreements	6,242	3,907
Up to 30 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	112,426	74,120
Securities lending agreements	0	0
30-90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	30,073	28,270
Securities lending agreements	1,000	0
Over 90 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	22,737	19,974
Securities lending agreements	$ 2,901	$ 3,651