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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net realized gains (losses) $ (188) $ (627) $ 509
Net investment income 2,305 2,177 2,313
Interest Expense 199 213 234
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 (26) 6 41
Interest Expense 15 (2) (10)
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 10 9 5
Designated as Hedging Instrument | Cash Flow Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (25) 56 28
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Gain (Loss) on Investments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 0 0 0
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income (16) 15 46
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Expense [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 15 (2) (10)
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 6 0 4
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Gain (Loss) on Investments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 0 0 0
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign currency swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income (26) 6 41
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest Expense [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 15 (2) (10)
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (31) 56 24
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Gain (Loss) on Investments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 0 0 0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign currency swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income 10 9 5
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest Expense [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain Reclassified from AOCI into Income $ 0 $ 0 $ 0