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Investments, Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Cost or Amortized Cost [Abstract]
Cost or amortized cost	$ 39,826	$ 38,963
Estimated Fair Value [Abstract]
Estimated fair value	44,910	44,646
Available-for-Sale Fixed Maturities [Member]
Cost or Amortized Cost [Abstract]
Due in one year or less	1,685	1,456
Due after one year through five years	10,723	12,304
Due after five years through ten years	13,775	12,319
Due after ten years	13,633	12,847
Cost or amortized cost	39,816	38,926
Estimated Fair Value [Abstract]
Due in one year or less	1,702	1,458
Due after one year through five years	11,479	13,098
Due after five years through ten years	15,012	13,878
Due after ten years	16,707	16,170
Estimated fair value	$ 44,900	$ 44,604

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