v3.26.1
Guarantee Arrangements, Pledged Assets and Repurchase Agreements, Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements Accounted for as Secured Borrowings (Details) - U.S. Treasury, U.S. Government sponsored and U.S. Government agency securities - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings $ 4,800 $ 3,700
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 2,300 1,400
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 0 500
31 to 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 500 700
91 Days to One Year    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 2,000 1,100
Greater Than One Year    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings $ 0 $ 0