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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Dec. 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
Debt Securities, Available-for-sale, Amortized Cost | $ 85,188 | 82,580
Available for sale, Due in 1 year or less, Fair Value | 4,760 | 3,973
Available for sale, Due after 1 year through 5 years, Fair Value | 26,227 | 27,720
Available for sale, Due after 5 years through 10 years, Fair Value | 27,232 | 24,874
Available for sale, Due after 10 years, Fair Value | 14,010 | 9,729
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 72,229 | 66,296
Available for sale, Mortgage backed securities, Fair Value | 18,470 | 19,192
Available for sale, Fair Value | 90,699 | 85,488
Held to maturity, Due in 1 year or less, Amortized Cost |  | 478
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within on year, net carrying value | 1,231 |
Held to maturity, Due after 1 year through 5 years, Amortized Cost |  | 3,869
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, after one through five years, net carrying value | 3,592 |
Held to maturity, Due after 5 years through 10 years, Amortized Cost |  | 3,756
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, after five through ten years, net carrying value | 3,029 |
Held to maturity, Due after 10 years, Amortized Cost |  | 2,147
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, after 10 years, net carrying value | 1,802 |
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 9,654 |
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
Debt securities, Held-to-maturity, without single maturity date, net carrying value | 1,999 |
Debt Securities, Held-to-maturity | 11,697 | 12,581
Held to maturity, Due in 1 year or less, Fair Value | 1,240 | 479
Held to maturity, Due after 1 year through 5, Fair Value | 3,760 | 3,940
Held to maturity, Due after 5 years through 10 years, Fair Value | 3,228 | 3,883
Held to maturity, Due after 10 years, Fair Value | 2,136 | 2,307
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,364 | 10,609
Held to maturity, Mortgage backed securities, Fair Value | 2,146 | 2,396
Debt securities, held to maturity, net carrying value | 11,653 |
Held to maturity, Fair Value | $ 12,510 | $ 13,005

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