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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Amortized Cost | $ 3,951 | $ 3,569
Available for sale, Due after 1 year through 5 years, Amortized Cost | 27,142 | 27,134
Available for sale, Due after 5 years though 10 years, Amortized Cost | 23,901 | 24,095
Available for sale, Due after 10 years, Amortized Cost | 8,874 | 8,767
Available for sale, Mortgage-backed securities, Amortized Cost | 18,712 | 15,758
Debt Securities, Available-for-sale, Amortized Cost | 82,580 | 79,323
Available for sale, Due in 1 year or less, Fair Value | 3,973 | 3,568
Available for sale, Due after 1 year through 5 years, Fair Value | 27,720 | 27,005
Available for sale, Due after 5 years through 10 years, Fair Value | 24,874 | 23,543
Available for sale, Due after 10 years, Fair Value | 9,729 | 8,814
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 63,868 | 63,565
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 66,296 | 62,930
Available for sale, Mortgage backed securities, Fair Value | 19,192 | 15,540
Available for sale, Fair Value | 85,488 | 78,470
Held to maturity, Due in 1 year or less, Amortized Cost | 478 | 536
Held to maturity, Due after 1 year through 5 years, Amortized Cost | 3,869 | 3,122
Held to maturity, Due after 5 years through 10 years, Amortized Cost | 3,756 | 4,468
Held to maturity, Due after 10 years, Amortized Cost | 2,147 | 2,785
Held to maturity, Mortgage backed securities, Amortized Cost | 2,331 | 2,524
Debt Securities, Held-to-maturity | 12,581 | 13,435
Held to maturity, Due in 1 year or less, Fair Value | 479 | 537
Held to maturity, Due after 1 year through 5, Fair Value | 3,940 | 3,106
Held to maturity, Due after 5 years through 10 years, Fair Value | 3,883 | 4,407
Held to maturity, Due after 10 years, Fair Value | 2,307 | 2,723
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 10,250 | 10,911
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,609 | 10,773
Held to maturity, Mortgage backed securities, Fair Value | 2,396 | 2,486
Held to maturity, Fair Value | $ 13,005 | $ 13,259

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