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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value | $ 4,393 | $ 4,498
Available for sale, Due after 1 year through 5 years, Fair Value & Net Carrying Value | 25,136 | 25,542
Available for sale, Due after 5 years through 10 years, Fair Value & Net Carrying Value | 27,033 | 28,207
Available for sale, Due after 10 years, Fair Value & Net Carrying Value | 13,112 | 14,372
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 69,674 | 72,619
Available for sale, Mortgage backed securities, Fair Value & Net Carrying Value | 19,805 | 20,489
Available for sale, Fair Value | 89,479 | 93,108
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value | 871 | 888
Held to maturity, Due in 1 year or less, Fair Value | 872 | 894
Held-to-maturity, after one through five years, net carrying value | 3,754 | 3,744
Held to maturity, Due after 1 year through 5, Fair Value | 3,742 | 3,846
Held-to-maturity, after 5 through 10 years, net carrying value | 2,004 | 2,242
Held to maturity, Due after 5 years through 10 years, Fair Value | 2,015 | 2,349
Held-to-maturity, after 10 years, net carrying value | 1,500 | 1,514
Held to maturity, Due after 10 years, Fair Value | 1,575 | 1,755
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value | 8,129 | 8,388
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 8,204 | 8,844
Held-to-maturity, MBS, net carrying value | 1,689 | 1,730
Held to maturity, Mortgage backed securities, Fair Value | 1,684 | 1,803
Debt securities, held to maturity, net carrying value | 9,818 | 10,118
Held to maturity, Fair Value | $ 9,888 | $ 10,647

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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 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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