Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Cost or Amortized Cost
Cost or Amortized Cost	$ 45,250	$ 44,196
Estimated Fair Value
Estimated Fair Value	43,984	41,827
Available-for-sale Fixed Maturities
Cost or Amortized Cost
Due in one year or less	1,392	1,761
Due after one year through five years	11,318	11,678
Due after five years through ten years	13,440	13,083
Due after ten years	18,467	16,908
Cost or Amortized Cost	44,617	43,430
Estimated Fair Value
Due in one year or less	1,389	1,753
Due after one year through five years	11,214	11,403
Due after five years through ten years	13,187	12,365
Due after ten years	17,561	15,540
Estimated Fair Value	$ 43,351	$ 41,061