Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 2,187	$ 2,387
Available for sale, Due after 1 year through 5 years, Amortized Cost	15,444	14,139
Available for sale, Due after 5 years though 10 years, Amortized Cost	15,663	16,200
Available for sale, Due after 10 years, Amortized Cost	4,521	4,743
Available for sale, Subtotal, Amortized Cost	37,815	37,469
Available for sale, Mortgage-backed securities, Amortized Cost	10,011	10,937
Available for sale, Amortized Cost	47,826	48,406
Available for sale, Due in 1 year or less, Fair Value	2,206	2,411
Available for sale, Due after 1 year through 5 years, Fair Value	15,857	14,602
Available for sale, Due after 5 years through 10 years, Fair Value	16,089	16,535
Available for sale, Due after 10 years, Fair Value	4,957	4,812
Available for sale, Subtotal, Fair Value	39,109	38,360
Available for sale, Mortgage backed securities, Fair Value	10,286	10,894
Available for sale, Fair Value	49,395	49,254
Held to maturity, Due in 1 year or less, Amortized Cost	353	401
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,603	2,284
Held to maturity, Due after 5 years through 10 years, Amortized Cost	1,439	1,686
Held to maturity, Due after 10 years, Amortized Cost	953	386
Held to maturity, Subtotal, Amortized Cost	5,348	4,757
Held to maturity, Mortgage backed securities, Amortized Cost	1,983	1,341
Held-to-maturity Securities	7,331us-gaap_HeldToMaturitySecurities	6,098us-gaap_HeldToMaturitySecurities
Held to maturity, Due in 1 year or less, Fair Value	355	405
Held to maturity, Due after 1 year through 5, Fair Value	2,693	2,363
Held to maturity, Due after 5 years through 10 years, Fair Value	1,489	1,723
Held to maturity, Due after 10 years, Fair Value	1,013	393
Held to maturity, Subtotal, Fair Value	5,550	4,884
Held to maturity, Mortgage backed securities, Fair Value	2,039	1,379
Held to maturity, Fair Value	$ 7,589	$ 6,263

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 after the tenth fiscal year following the latest fiscal year.

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-SubTopic 320

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Fair value of held-to-maturity 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 held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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Fair value of investments in debt securities classified as held-to-maturity.

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