v3.26.1
Fair Value of Financial Instruments - Schedule of Gains and Losses Included in Net Income (Loss) from Assets Measured at Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in net income (loss): $ (1) $ (5)
Total gains (losses) included in net income (loss) attributable to assets still held: $ (1) $ (5)
Fair Value, Asset, 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, Asset, 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in net income (loss): $ 1 $ 0
Total gains (losses) included in net income (loss) attributable to assets still held: $ 1 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment income Net investment income
Fair Value, Asset, 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in net income (loss): $ (2) $ (5)
Total gains (losses) included in net income (loss) attributable to assets still held: $ (2) $ (5)
Fair Value, Asset, 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, Asset, Recurring Basis, Still Held, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments