Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 1,856	$ 2,187
Available for sale, Due after 1 year through 5 years, Amortized Cost	14,936	15,444
Available for sale, Due after 5 years though 10 years, Amortized Cost	12,258	15,663
Available for sale, Due after 10 years, Amortized Cost	4,272	4,521
Available for sale, Subtotal, Amortized Cost	33,322	37,815
Available for sale, Mortgage-backed securities, Amortized Cost	9,827	10,011
Available for sale, Amortized Cost	43,149	47,826
Available for sale, Due in 1 year or less, Fair Value	1,865	2,206
Available for sale, Due after 1 year through 5 years, Fair Value	15,104	15,857
Available for sale, Due after 5 years through 10 years, Fair Value	12,173	16,089
Available for sale, Due after 10 years, Fair Value	4,487	4,957
Available for sale, Subtotal, Fair Value	33,629	39,109
Available for sale, Mortgage backed securities, Fair Value	9,958	10,286
Available for sale, Fair Value	43,587	49,395
Held to maturity, Due in 1 year or less, Amortized Cost	492	353
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,443	2,603
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,292	1,439
Held to maturity, Due after 10 years, Amortized Cost	1,496	953
Held to maturity, Subtotal, Amortized Cost	6,723	5,348
Held to maturity, Mortgage backed securities, Amortized Cost	1,707	1,983
Held to maturity, Amortized Cost	8,430	7,331
Held to maturity, Due in 1 year or less, Fair Value	495	355
Held to maturity, Due after 1 year through 5, Fair Value	2,517	2,693
Held to maturity, Due after 5 years through 10 years, Fair Value	2,313	1,489
Held to maturity, Due after 10 years, Fair Value	1,484	1,013
Held to maturity, Subtotal, Fair Value	6,809	5,550
Held to maturity, Mortgage backed securities, Fair Value	1,743	2,039
Held to maturity, Fair Value	$ 8,552	$ 7,589

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 fair value of HTM securities excluding mortgage-backed securities.

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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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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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