v3.26.1
Derivative Financial Instruments - Schedule of Gains (Losses) from Valuation and Settlements Reported on Derivatives Not Designated as Accounting Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives $ 7 $ (45) $ (1) $ (75)
Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 33 20 31 9
Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (26) (65) (32) (84)
Interest rate contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (33) (9) (46) (10)
Interest rate contracts | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 0 0 0 0
Interest rate contracts | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (33) (9) (46) (10)
Equity and index contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 32 9 24 (2)
Equity and index contracts | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 31 17 23 6
Equity and index contracts | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 1 (8) 1 (8)
Contingent consideration        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 2 3 8 3
Contingent consideration | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 2 3 8 3
Contingent consideration | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 0 0 0 0
Foreign currency contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 1 (38) 11 (56)
Foreign currency contracts | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 0 0 0 0
Foreign currency contracts | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 1 (38) 11 (56)
Credit default contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 5 (10) 2 (10)
Credit default contracts | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 0 0 0 0
Credit default contracts | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives $ 5 $ (10) $ 2 $ (10)