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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,776	$ 3,569
Available for sale, Due after 1 year through 5 years, Amortized Cost	27,308	27,134
Available for sale, Due after 5 years though 10 years, Amortized Cost	23,367	24,095
Available for sale, Due after 10 years, Amortized Cost	8,804	8,767
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	63,255	63,565
Available for sale, Mortgage-backed securities, Amortized Cost	16,369	15,758
Available for sale, at amortized cost	79,624	79,323
Available for sale, Due in 1 year or less, Fair Value	3,785	3,568
Available for sale, Due after 1 year through 5 years, Fair Value	27,593	27,005
Available for sale, Due after 5 years through 10 years, Fair Value	23,690	23,543
Available for sale, Due after 10 years, Fair Value	9,165	8,814
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	64,233	62,930
Available for sale, Mortgage backed securities, Fair Value	16,430	15,540
Available for sale, Fair Value	80,663	78,470
Held to maturity, Due in 1 year or less, Amortized Cost	614	536
Held to maturity, Due after 1 year through 5 years, Amortized Cost	3,111	3,122
Held to maturity, Due after 5 years through 10 years, Amortized Cost	4,246	4,468
Held to maturity, Due after 10 years, Amortized Cost	2,681	2,785
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	10,652	10,911
Held to maturity, Mortgage backed securities, Amortized Cost	2,484	2,524
Held to maturity, Amortized Cost	13,136	13,435
Held to maturity, Due in 1 year or less, Fair Value	616	537
Held to maturity, Due after 1 year through 5, Fair Value	3,125	3,106
Held to maturity, Due after 5 years through 10 years, Fair Value	4,287	4,407
Held to maturity, Due after 10 years, Fair Value	2,718	2,723
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	10,746	10,773
Held to maturity, Mortgage backed securities, Fair Value	2,494	2,486
Held to maturity, Fair Value	$ 13,240	$ 13,259

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next 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.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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