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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)

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