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Derivative Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]      
Asset derivatives - fair value $ 180 $ 206  
Liability derivatives - fair value (72) (115)  
Derivative offsetting      
Derivative assets subject to master netting agreements 180 206  
Derivative liabilities subject to master netting agreements (72) (115)  
Net realized gains (losses) on derivative instruments      
Net realized gains (losses) on derivative instruments $ 327 $ 8 $ 59
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) Net realized gains (losses) Net realized gains (losses)
Not Designated as Hedging Instrument      
Derivative [Line Items]      
Asset derivatives - fair value $ 180 $ 206  
Liability derivatives - fair value (72) (115)  
Net realized gains (losses) on derivative instruments      
Net realized gains (losses) on derivative instruments 327 8 $ 59
Not Designated as Hedging Instrument | Futures contracts      
Derivative [Line Items]      
Asset derivatives - fair value [1] 81 78  
Liability derivatives - fair value [1] (19) (46)  
Net derivatives - notional value [2] 8,022 4,781  
Net realized gains (losses) on derivative instruments      
Net realized gains (losses) on derivative instruments 211 4 49
Not Designated as Hedging Instrument | Foreign currency forward contracts      
Derivative [Line Items]      
Asset derivatives - fair value [1] 75 90  
Liability derivatives - fair value [1] (38) (48)  
Net derivatives - notional value [2] 2,458 1,698  
Net realized gains (losses) on derivative instruments      
Net realized gains (losses) on derivative instruments 65 (6) 21
Not Designated as Hedging Instrument | Other      
Derivative [Line Items]      
Asset derivatives - fair value [1],[3] 24 38  
Liability derivatives - fair value [1],[3] (15) (21)  
Net derivatives - notional value [2],[3] 161 236  
Net realized gains (losses) on derivative instruments      
Net realized gains (losses) on derivative instruments [4] $ 51 $ 10 $ (11)
[1] The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’
[2] Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.
[3] Includes swaps, options and other derivatives contracts
[4] Includes realized gains or losses on swaps, options and other derivatives contracts.