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Investments (Summary Of Amortized Cost And Fair Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fixed maturity securities - available for sale: |  |
Amortized Cost | $ 23,204 | $ 22,064
Fair Value | 21,009 | 22,308
Fixed Maturity Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Due in one year or less, Amortized Cost | 1,257 | 1,399
Due after one year through five years, Amortized Cost | 7,875 | 7,075
Due after five years through ten years, Amortized Cost | 4,603 | 5,004
Due after ten years, Amortized Cost | 1,456 | 1,606
Amortized Cost | 23,204 | 22,064
Due in one year or less, Fair Value | 1,258 | 1,398
Due after one year through five years, Fair Value | 7,216 | 7,154
Due after five years through ten years, Fair Value | 3,938 | 5,101
Due after ten years, Fair Value | 1,189 | 1,627
Fair Value | 21,009 | 22,308
Fixed maturity securities - held to maturity: |  |
Due after one year through five years, Amortized Cost | 61 |
Due after five years through ten years, Amortized Cost | 46 |
Due after ten years, Amortized Cost | 80 |
Amortized Cost | 846 |
Due after one year through five years, Fair Value | 58 |
Due after five years through ten years, Fair Value | 41 |
Due after ten years, Fair Value | 74 |
Fair Value | 817 |
Asset-Backed Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 3,935 | 3,579
Fair Value | 3,772 | 3,582
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 653 |
Fair Value | 639 |
Mortgage-Backed Securities: Commercial [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,016 | 1,033
Fair Value | 908 | 1,064
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 6 |
Fair Value | 6 |
Mortgage Backed Securities: Agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 3,058 | 2,361
Fair Value | 2,723 | 2,375
Mortgage Backed Securities: Non-agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 5 | 7
Fair Value | $ 5 | $ 7

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