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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions | Dec. 31, 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 | $ 4,729 | $ 2,962
Available for sale, Due after 1 year through 5 years, Fair Value & Carrying Value | 33,573 | 24,791
Available for sale, Due after 5 years through 10 years, Fair Value & Carrying Value | 28,480 | 26,679
Available for sale, Due after 10 years, Fair Value & Carrying Value | 17,731 | 14,937
Available for sale, Maturity, Allocated and Single Maturity Date, Fair Value | 84,513 | 69,369
Available for sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 84,513 | 69,369
Available for sale, Mortgage backed securities, Fair Value | 22,058 | 15,851
Available for sale, Mortgage-backed securities, Amortized Cost | 22,058 | 15,851
Available for sale, Fair Value | 106,571 | 85,220
Held to maturity, Due in 1 year or less, net carrying value | 0 | 1,015
Held to maturity, maturity, Due after 1 year through 5 years, net carrying value | 0 | 3,658
Held to maturity, Due after 5 years through 10 years, net carrying value | 0 | 1,460
Held to maturity, Due after 10 years, net carrying value | 0 | 1,260
Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 0 | 7,393
Held-to-maturity, mortgage-backed securities, net carrying value | 0 | 1,455
Debt securities, held to maturity, net carrying value | 0 | 8,848
Held to maturity, Due in 1 year or less, Fair Value | 0 | 1,003
Held to maturity, Due after 1 year through 5 years, Fair Value | 0 | 3,531
Held to maturity, Due after 5 years through 10 years, Fair Value | 0 | 1,423
Held to maturity, Due after 10 years, Fair Value | 0 | 1,131
Held to maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 0 | 7,088
Held to maturity, Mortgage backed securities, Fair Value | 0 | 1,351
Held to maturity, Fair Value | $ 0 | $ 8,439

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