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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Fair Value | $ 4,536 | $ 4,760
Available for sale, Due after 1 year through 5 years, Fair Value | 26,142 | 26,227
Available for sale, Due after 5 years through 10 years, Fair Value | 27,953 | 27,232
Available for sale, Due after 10 years, Fair Value | 13,979 | 14,010
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 72,610 | 72,229
Available for sale, Mortgage backed securities, Fair Value | 19,553 | 18,470
Available for sale, Fair Value | 92,163 | 90,699
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value | 880 | 1,231
Held to maturity, Due in 1 year or less, Fair Value | 887 | 1,240
Held-to-maturity, after one through five years, net carrying value | 3,579 | 3,592
Held to maturity, Due after 1 year through 5, Fair Value | 3,716 | 3,760
Held-to-maturity, after 5 through 10 years, net carrying value | 2,734 | 3,029
Held to maturity, Due after 5 years through 10 years, Fair Value | 2,887 | 3,228
Held-to-maturity, after 10 years, net carrying value | 1,699 | 1,802
Held to maturity, Due after 10 years, Fair Value | 1,961 | 2,136
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 8,892 | 9,654
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 9,451 | 10,364
Held-to-maturity, MBS, net carrying value | 1,781 | 1,999
Held to maturity, Mortgage backed securities, Fair Value | 1,892 | 2,146
Debt securities, held to maturity, net carrying value | 10,673 | 11,653
Held to maturity, Fair Value | $ 11,343 | $ 12,510

X
- Definition Amount of investment in debt security, measured at amortized cost (held-to-maturity) net of valuation allowance, with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity) net of valuation allowance, with single maturity date and allocated without single maturity date, maturing in next fiscal year through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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