Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,402	$ 1,856
Available for sale, Due after 1 year through 5 years, Amortized Cost	25,152	14,936
Available for sale, Due after 5 years though 10 years, Amortized Cost	26,702	12,258
Available for sale, Due after 10 years, Amortized Cost	10,291	4,272
Available for sale, Subtotal, Amortized Cost	65,547	33,322
Available for sale, Mortgage-backed securities, Amortized Cost	13,083	9,827
Available for sale, at amortized cost	78,630	43,149
Available for sale, Fair Value	81,358	43,587
Held to maturity, Due in 1 year or less, Amortized Cost	458	492
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,716	2,443
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,815	2,292
Held to maturity, Due after 10 years, Amortized Cost	3,431	1,496
Held to maturity, Subtotal, Amortized Cost	9,420	6,723
Held to maturity, Mortgage backed securities, Amortized Cost	1,507	1,707
Available for sale, Due in 1 year or less, Fair Value	3,413	1,865
Available for sale, Due after 1 year through 5 years, Fair Value	25,865	15,104
Available for sale, Due after 5 years through 10 years, Fair Value	27,645	12,173
Available for sale, Due after 10 years, Fair Value	10,974	4,487
Available for sale, Subtotal, Fair Value	67,897	33,629
Available for sale, Mortgage backed securities, Fair Value	13,461	9,958
Held to maturity, Due in 1 year or less, Fair Value	462	495
Held to maturity, Due after 1 year through 5, Fair Value	2,807	2,517
Held to maturity, Due after 5 years through 10 years, Fair Value	2,919	2,313
Held to maturity, Due after 10 years, Fair Value	3,599	1,484
Held to maturity, Subtotal, Fair Value	9,787	6,809
Held to maturity, Mortgage backed securities, Fair Value	1,579	1,743
Held to maturity, Amortized Cost	10,927	8,430
Held to maturity, Fair Value	$ 11,366	$ 8,552

Subtotal of the amortized cost of AFS securities excluding mortgage-backed securities.

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Subtotal of the fair value of AFS securities excluding mortgage-backed securities.

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Subtotal of the amortized cost of HTM securities excluding mortgage-backed securities.

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Subtotal of the fair value of HTM securities excluding mortgage-backed securities.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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