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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total realized and unrealized gains (losses) included in net income (loss): $ 6 $ (2) $ 5 $ (7)
Total gains (losses) included in net income (loss) attributable to assets still held: $ 5 $ 0 $ 6 $ (4)
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 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 Gain (Loss) on Investments, Net investment income Gain (Loss) on Investments, Net investment income
Location, Statement of Income, Balance [Axis]: us-gaap:GainLossOnInvestments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total realized and unrealized gains (losses) included in net income (loss): $ 5 $ (2) $ 3 $ (7)
Total gains (losses) included in net income (loss) attributable to assets still held: $ 4 $ 0 $ 4 $ (4)
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 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 Gain (Loss) on Investments Gain (Loss) on Investments
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome        
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 $ 2 $ 0
Total gains (losses) included in net income (loss) attributable to assets still held: $ 1 $ 0 $ 2 $ 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 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 income Net investment income