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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net realized losses $ (61) $ (188) $ (627)
Net investment income 2,568 2,305 2,177
Interest Expense 199 199 213
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 27 (25) 56
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income (13) (16) 15
Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 16 15 (2)
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 (25) (26) 6
Interest Expense 16 15 (2)
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 (14) 6 0
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | 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]      
Gain Reclassified from AOCI into Income (25) (26) 6
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 16 15 (2)
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 12 10 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 41 (31) 56
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | 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]      
Gain Reclassified from AOCI into Income 12 10 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income $ 0 $ 0 $ 0