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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,361
Due after one year through five years	8,345
Due after five year through ten years	10,956
Due after ten years	25,101
Asset and mortgage-backed securities	6,466
Total	52,229	$ 49,548
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,378
Due after one year through five years	8,829
Due after five year through ten years	11,763
Due after ten years	27,874
Asset and mortgage-backed securities	6,582
Total	$ 56,426	$ 56,735

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