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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Jun. 30, 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 | $ 82,740 | 82,580
Available for sale, Due in 1 year or less, Fair Value | 4,487 | 3,973
Available for sale, Due after 1 year through 5 years, Fair Value | 26,867 | 27,720
Available for sale, Due after 5 years through 10 years, Fair Value | 25,465 | 24,874
Available for sale, Due after 10 years, Fair Value | 11,695 | 9,729
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 68,514 | 66,296
Available for sale, Mortgage backed securities, Fair Value | 18,198 | 19,192
Available for sale, Fair Value | 86,712 | 85,488
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value | 890 |
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 | 11,896 | 12,581
Held to maturity, Due in 1 year or less, Fair Value | 902 | 479
Held-to-maturity, after one through five years, net carrying value | 3,505 |
Held to maturity, Due after 1 year through 5, Fair Value | 3,662 | 3,940
Held-to-maturity, after 5 through 10 years, net carrying value | 3,328 |
Held to maturity, Due after 5 years through 10 years, Fair Value | 3,516 | 3,883
Held-to-maturity, after 10 years, net carrying value | 1,934 |
Held to maturity, Due after 10 years, Fair Value | 2,209 | 2,307
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 9,657 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,289 | 10,609
Held-to-maturity, MBS, net carrying value | 2,188 |
Held to maturity, Mortgage backed securities, Fair Value | 2,331 | 2,396
Debt securities, held to maturity, net carrying value | 11,845 |
Held to maturity, Fair Value | $ 12,620 | $ 13,005

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