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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Amortized Cost | $ 3,869 | $ 3,569
Available for sale, Due after 1 year through 5 years, Amortized Cost | 27,168 | 27,134
Available for sale, Due after 5 years though 10 years, Amortized Cost | 23,368 | 24,095
Available for sale, Due after 10 years, Amortized Cost | 9,174 | 8,767
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 63,579 | 63,565
Available for sale, Mortgage-backed securities, Amortized Cost | 18,457 | 15,758
Available for sale, at amortized cost | 82,036 | 79,323
Available for sale, Due in 1 year or less, Fair Value | 3,889 | 3,568
Available for sale, Due after 1 year through 5 years, Fair Value | 27,728 | 27,005
Available for sale, Due after 5 years through 10 years, Fair Value | 24,309 | 23,543
Available for sale, Due after 10 years, Fair Value | 10,104 | 8,814
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 66,030 | 62,930
Available for sale, Mortgage backed securities, Fair Value | 19,014 | 15,540
Available for sale, Fair Value | 85,044 | 78,470
Held to maturity, Due in 1 year or less, Amortized Cost | 487 | 536
Held to maturity, Due after 1 year through 5 years, Amortized Cost | 3,567 | 3,122
Held to maturity, Due after 5 years through 10 years, Amortized Cost | 3,822 | 4,468
Held to maturity, Due after 10 years, Amortized Cost | 2,355 | 2,785
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 10,231 | 10,911
Held to maturity, Mortgage backed securities, Amortized Cost | 2,391 | 2,524
Held to maturity, Amortized Cost | 12,622 | 13,435
Held to maturity, Due in 1 year or less, Fair Value | 490 | 537
Held to maturity, Due after 1 year through 5, Fair Value | 3,629 | 3,106
Held to maturity, Due after 5 years through 10 years, Fair Value | 3,959 | 4,407
Held to maturity, Due after 10 years, Fair Value | 2,544 | 2,723
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,622 | 10,773
Held to maturity, Mortgage backed securities, Fair Value | 2,474 | 2,486
Held to maturity, Fair Value | $ 13,096 | $ 13,259

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