v3.25.2
Investments (Contractual maturity) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Investments [Abstract]    
Due in one year or less, cost or amortized cost $ 1,627 $ 1,761
Due after one year through five years, cost or amortized cost 12,083 11,678
Due after five years through ten years, cost or amortized cost 12,865 13,134
Due after ten years, cost or amortized cost 18,135 16,908
Cost or Amortized Cost 44,710 43,481
Due in one year or less, estimated fair value 1,611 1,753
Due after one year through five years, estimated fair value 11,843 11,403
Due after five years through ten years, estimated fair value 12,467 12,415
Due after ten years, estimated fair value 16,862 15,540
Estimated Fair Value $ 42,783 $ 41,111