v3.26.3
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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives $ (46) $ 24 $ (47) $ (51)
Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (5) 18 26 27
Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (41) 6 (73) (78)
Interest rate contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (46) 2 (92) (8)
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 (46) 2 (92) (8)
Equity and index contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (3) 13 21 11
Equity and index contracts | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (4) 15 19 21
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 (2) 2 (10)
Contingent consideration        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (1) 3 7 6
Contingent consideration | Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives (1) 3 7 6
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 4 6 15 (50)
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 4 $ 6 15 (50)
Credit default contracts        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives 0   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
Credit default contracts | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Derivative Instruments, Gain (Loss)        
Gains (losses) from valuation and settlements reported on derivatives $ 0   $ 2 $ (10)