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Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of Gains (Losses) from Valuation and Settlements Reported on Derivatives Not Designated as Accounting Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives $ (38) $ 24 $ (42)
Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (76) (14) (84)
Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 38 38 42
Interest rate contracts      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (10) (32) (8)
Interest rate contracts | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (10) (32) (8)
Interest rate contracts | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 0 0 0
Equity and index contracts      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 15 5 (4)
Equity and index contracts | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (10) (17) (32)
Equity and index contracts | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 25 22 28
Contingent consideration      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 13 16 15
Contingent consideration | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 0 0 0
Contingent consideration | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 13 16 15
Foreign currency contracts      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (48) 32 (14)
Foreign currency contracts | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (48) 32 (14)
Foreign currency contracts | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives 0 0 0
Credit default contracts      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (8) 3 (30)
Credit default contracts | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives (8) 3 (30)
Credit default contracts | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives $ 0 $ 0 0
Other contracts      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives     (1)
Other contracts | Net gains (losses) on investments and derivatives      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives     0
Other contracts | Operating costs and expenses      
Derivative Instruments, Gain (Loss)      
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives     $ (1)