v3.26.3
Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Collateral required to be posted under agreements $ 36   $ 36   $ 93
Variation Margin Adjustment 138   138   98
Counterparty default losses on forward contracts 0 $ 0 0 $ 0  
Credit Derivatives [Line Items]          
Commitments    
Interest rate swaps          
Credit Derivatives [Line Items]          
Derivative asset, notional amount 4,400   4,400   4,500
Derivative liability, notional amount 4,500   4,500   4,500
Interest rate futures          
Credit Derivatives [Line Items]          
Derivative, notional amount 270   270   211
Mortgage-Backed Security          
Credit Derivatives [Line Items]          
Derivative, notional amount 7   7   34
Commitments To Originate Loans Held For Sale          
Credit Derivatives [Line Items]          
Commitments 41   41   39
Interest rate forward sales commitments          
Credit Derivatives [Line Items]          
Commitments $ 51   $ 51   $ 74