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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Amortized Cost |  | $ 3,951
Available for sale, Due after 1 year through 5 years, Amortized Cost |  | 27,142
Available for sale, Due after 5 years though 10 years, Amortized Cost |  | 23,901
Available for sale, Due after 10 years, Amortized Cost |  | 8,874
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost |  | 63,868
Available for sale, Mortgage-backed securities, Amortized Cost |  | 18,712
Available for sale, at amortized cost | $ 80,959 | 82,580
Available for sale, Due in 1 year or less, Fair Value | 3,816 | 3,973
Available for sale, Due after 1 year through 5 years, Fair Value | 25,837 | 27,720
Available for sale, Due after 5 years through 10 years, Fair Value | 23,712 | 24,874
Available for sale, Due after 10 years, Fair Value | 10,280 | 9,729
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 63,645 | 66,296
Available for sale, Mortgage backed securities, Fair Value | 17,885 | 19,192
Available for sale, Fair Value | 81,530 | 85,488
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value | 614 |
Held to maturity, Due in 1 year or less, Amortized Cost |  | 478
Held to maturity, Due after 1 year through 5 years, Amortized Cost |  | 3,869
Held to maturity, Due after 5 years through 10 years, Amortized Cost |  | 3,756
Held to maturity, Due after 10 years, Amortized Cost |  | 2,147
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost |  | 10,250
Held to maturity, Mortgage backed securities, Amortized Cost |  | 2,331
Held to maturity, Amortized Cost | 12,070 | 12,581
Held to maturity, Due in 1 year or less, Fair Value | 620 | 479
Held-to-maturity, after one through five years, net carrying value | 3,695 |
Held to maturity, Due after 1 year through 5, Fair Value | 3,775 | 3,940
Held-to-maturity, after 5 through 10 years, net carrying value | 3,383 |
Held to maturity, Due after 5 years through 10 years, Fair Value | 3,479 | 3,883
Held-to-maturity, after 10 years, net carrying value | 2,068 |
Held to maturity, Due after 10 years, Fair Value | 2,230 | 2,307
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 9,760 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,104 | 10,609
Held-to-maturity, MBS, net carrying value | 2,265 |
Held to maturity, Mortgage backed securities, Fair Value | 2,367 | 2,396
Debt securities, held to maturity, net carrying value | 12,025 |
Held to maturity, Fair Value | $ 12,471 | $ 13,005

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