v3.26.1
Fair Value of Financial Instruments - Schedule of Gains and Losses Included in Net (Income) from Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized (gains) losses included in net (income) loss: $ (1) $ (9)
Total (gains) losses included in net (income) loss attributable to liabilities still held: $ (1) $ (9)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments, Net investment income Gain (Loss) on Investments, Net investment income
Fair Value, Liability, Recurring Basis, Still Held, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments, Net investment income Gain (Loss) on Investments, Net investment income
Net investment income    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized (gains) losses included in net (income) loss: $ 0 $ 0
Total (gains) losses included in net (income) loss attributable to liabilities still held: $ 0 $ 0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment income Net investment income
Fair Value, Liability, Recurring Basis, Still Held, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment income Net investment income
Net investment (gains) losses    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized (gains) losses included in net (income) loss: $ (1) $ (9)
Total (gains) losses included in net (income) loss attributable to liabilities still held: $ (1) $ (9)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Fair Value, Liability, Recurring Basis, Still Held, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments