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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net Investment Income $ 759 $ 659 $ 2,079 $ 1,854
Interest Expense 50 49 150 149
Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 14 2 (22) 13
Cash Flow Hedging | Designated as Hedging Instrument | Net investment income | Reclassification out of Accumulated Other Comprehensive Income        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity 0 (6) 1 (15)
Cash Flow Hedging | Designated as Hedging Instrument | Interest expense | Reclassification out of Accumulated Other Comprehensive Income        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity 3 4 9 13
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net Investment Income (3) (9) (7) (24)
Interest Expense 3 4 9 13
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0 25 13 4
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Net investment income | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity (3) (9) (7) (24)
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest expense | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity 3 4 9 13
Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net Investment Income 3 3 8 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 14 (23) (35) 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | Net investment income | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity 3 3 8 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest expense | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) on Hedging Activity $ 0 $ 0 $ 0 $ 0