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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net Investment Income $ 664 $ 602 $ 1,320 $ 1,195
Interest Expense 50 50 100 100
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 (40) 11 (36) 11
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 (5) 1 (9)
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 5 6 9
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) (8) (4) (15)
Interest Expense 3 5 6 9
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 3 (4) 13 (21)
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 (2) (8) (4) (15)
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 5 6 9
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 2 3 5 6
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 (43) 15 (49) 32
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 2 3 5 6
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