Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Cost or Amortized Cost
Cost or Amortized Cost	$ 41,588	$ 39,952
Estimated Fair Value
Estimated Fair Value	37,504	44,380
Available-for-sale Fixed Maturities
Cost or Amortized Cost
Due in one year or less	952	1,603
Due after one year through five years	9,487	10,637
Due after five years through ten years	14,323	13,294
Due after ten years	16,556	14,411
Cost or Amortized Cost	41,318	39,945
Estimated Fair Value
Due in one year or less	948	1,624
Due after one year through five years	9,000	11,229
Due after five years through ten years	12,765	14,338
Due after ten years	14,526	17,182
Estimated Fair Value	$ 37,239	$ 44,373