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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net realized gains (losses) $ (627) $ 509 $ (14)
Net investment income 2,177 2,313 1,846
Interest Expense 213 234 236
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 6 41 29
Interest Expense (2) (10) (7)
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 realized gains (losses) 0 0 (1)
Net investment income 9 5 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 56 28 30
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 (1)
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 15 46 34
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 (2) (10) (7)
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 0 4 38
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 6 41 29
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 (2) (10) (7)
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 56 24 (8)
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 (1)
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 9 5 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