v3.26.3
Fair Value Measurements - Fair Value Option (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fixed maturities, at fair value using the fair value option ("FVO Securities") $ 123   $ 123   $ 168
Changes in fair value of assets using fair value option 0 $ 7 (37) $ (10)  
Collateralized Loan Obligations [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fixed maturities, at fair value using the fair value option ("FVO Securities") $ 123   $ 123   $ 168