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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Net Investment Income $ 656 $ 593
Interest Expense 50 50
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 4 0
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) Reclassified from AOCI into Income (Effective Portion) 1 (4)
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) Reclassified from AOCI into Income (Effective Portion) 3 4
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 (2) (7)
Interest Expense 3 4
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 10 (17)
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) Reclassified from AOCI into Income (Effective Portion) (2) (7)
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) Reclassified from AOCI into Income (Effective Portion) 3 4
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
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 (6) 17
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) Reclassified from AOCI into Income (Effective Portion) 3 3
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) Reclassified from AOCI into Income (Effective Portion) $ 0 $ 0