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Derivative Financial Instruments - Effect of Qualifying Hedge Accounting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Net investment income $ 583 $ 506 $ 1,727 $ 1,553
Net gains (losses) (21) (14) (96) 25
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 20 (145) (28) 28
Interest rate contracts | Net gains (losses)        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 4 (129) (73) 36
Interest rate contracts | Designated as Hedging Instrument | Net investment income        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 0 0 0 0
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 0 0 0 0
Interest rate contracts | Designated as Hedging Instrument | Net gains (losses)        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 0 7 0 8
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 0 (7) 0 (8)
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0 0
Foreign exchange contracts | Net gains (losses)        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 2 (1) 7 (4)
Foreign exchange contracts | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 1 0 2 1
Foreign exchange contracts | Designated as Hedging Instrument | Net investment income        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 0 0 0 0
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 0 0 0 0
Foreign exchange contracts | Designated as Hedging Instrument | Net gains (losses)        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 1 3 14 1
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 1 (4) (12) 0
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1 5 4 11
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Net investment income        
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1 2 4 7
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Net gains (losses)        
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ 0 $ 3 $ 0 $ 4