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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value | $ 4,805 | $ 2,962
Available for sale, Due after 1 year through 5 years, Fair Value & Net Carrying Value | 31,738 | 24,791
Available for sale, Due after 5 years through 10 years, Fair Value & Net Carrying Value | 27,452 | 26,679
Available for sale, Due after 10 years, Fair Value & Net Carrying Value | 16,166 | 14,937
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 80,161 | 69,369
Available for sale, Mortgage backed securities, Fair Value & Net Carrying Value | 19,605 | 15,851
Available for sale, Fair Value | 99,766 | 85,220
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value | 0 | 1,015
Held to maturity, Due in 1 year or less, Fair Value | 0 | 1,003
Held-to-maturity, after one through five years, net carrying value | 0 | 3,658
Held to maturity, Due after 1 year through 5, Fair Value | 0 | 3,531
Held-to-maturity, after 5 through 10 years, net carrying value | 0 | 1,460
Held to maturity, Due after 5 years through 10 years, Fair Value | 0 | 1,423
Held-to-maturity, after 10 years, net carrying value | 0 | 1,260
Held to maturity, Due after 10 years, Fair Value | 0 | 1,131
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 0 | 7,393
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 0 | 7,088
Held-to-maturity, MBS, net carrying value | 0 | 1,455
Held to maturity, Mortgage backed securities, Fair Value | 0 | 1,351
Debt securities, held to maturity, net carrying value | 0 | 8,848
Held to maturity, Fair Value | $ 0 | $ 8,439

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