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Derivatives (Gross Interest Rate Swaps and Collateral Pledge) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative Assets    
Asset Derivatives $ 88 $ 109
Derivative Liabilities    
Derivative Liability 194 281
Interest rate contracts    
Derivative Assets    
Derivative Assets Gross Amounts Offsetting the Balance Sheets 0 0
Asset Derivatives 88 107
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset 9 6
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset 39 97
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral 40 4
Derivative Liabilities    
Derivative Liability, Gross Amounts Offset in Balance Sheets 0 0
Derivative Liability 193 277
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset 9 6
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset 7 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 177 271
Interest rate contracts | Not Designated as Hedging Instrument [Member]    
Derivative Assets    
Derivative assets, gross amounts of recognized assets 88 107
Derivative Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 193 $ 277