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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 1,345
Due after one year through five years	8,952
Due after five year through ten years	10,882
Due after ten years	26,445
Asset and mortgage-backed securities	6,723
Total	54,347	$ 49,548
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	1,355
Due after one year through five years	9,457
Due after five year through ten years	11,751
Due after ten years	29,861
Asset and mortgage-backed securities	6,865
Total	$ 59,289	$ 56,735

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