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Derivative Financial Instruments - Effect of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Net investment income $ 560 $ 529
Net gains (losses) (34) 43
Gain (loss) on derivative, net (37) 133
Not Designated as Hedging Instrument | Credit contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0 (1)
Interest rate contracts | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net (47) 126
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument | Other Comprehensive Income (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0 0
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument | Net investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0 0
Foreign exchange contracts | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 5 (2)
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Other Comprehensive Income (Loss)    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred (16) 8
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Net investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 2 3
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 2 3
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Net gains (losses)    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0 0
Foreign exchange contracts | Fair Value Hedging | Net investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0 0
Foreign exchange contracts | Fair Value Hedging | Net gains (losses)    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 4 (2)
Foreign exchange contracts | Fair Value Hedging | Designated as Hedging Instrument | Net investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0 0
Foreign exchange contracts | Fair Value Hedging | Designated as Hedging Instrument | Net gains (losses)    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net (4) 3
Embedded derivatives within reinsurance    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 5 0
Embedded derivatives within reinsurance | Level 3 | Measured at fair value on a recurring basis    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in derivative instruments excluded from assessment of hedge effectiveness and recognized in earnings 0 1
Gains (losses) from standalone derivatives recognized in Net gains (losses) 1 1
Equity contracts | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net (7) 10
Fixed maturities    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gains (losses) 4 (1)
Gain (loss) on derivative, net 4 (1)
Managed Custody Guarantees    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gains (losses) (1) 1
Gain (loss) on derivative, net (1) 1
Managed custody guarantees    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gains (losses) 4 0
Gain (loss) on derivative, net 4 0
Managed custody guarantees | Level 3 | Measured at fair value on a recurring basis    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) from standalone derivatives recognized in Net gains (losses) $ 3 $ 2