Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 2,021	$ 2,187
Available for sale, Due after 1 year through 5 years, Amortized Cost	16,209	15,444
Available for sale, Due after 5 years though 10 years, Amortized Cost	15,047	15,663
Available for sale, Due after 10 years, Amortized Cost	4,648	4,521
Available for sale, Subtotal, Amortized Cost	37,925	37,815
Available for sale, Mortgage-backed securities, Amortized Cost	10,459	10,011
Available for sale, Amortized Cost	48,384	47,826
Available for sale, Fair Value	50,410	49,395
Held to maturity, Due in 1 year or less, Amortized Cost	318	353
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,594	2,603
Held to maturity, Due after 5 years through 10 years, Amortized Cost	1,214	1,439
Held to maturity, Due after 10 years, Amortized Cost	949	953
Held to maturity, Subtotal, Amortized Cost	5,075	5,348
Held to maturity, Mortgage backed securities, Amortized Cost	1,907	1,983
Available for sale, Due in 1 year or less, Fair Value	2,042	2,206
Available for sale, Due after 1 year through 5 years, Fair Value	16,735	15,857
Available for sale, Due after 5 years through 10 years, Fair Value	15,649	16,089
Available for sale, Due after 10 years, Fair Value	5,176	4,957
Available for sale, Subtotal, Fair Value	39,602	39,109
Available for sale, Mortgage backed securities, Fair Value	10,808	10,286
Held to maturity, Due in 1 year or less, Fair Value	321	355
Held to maturity, Due after 1 year through 5, Fair Value	2,706	2,693
Held to maturity, Due after 5 years through 10 years, Fair Value	1,270	1,489
Held to maturity, Due after 10 years, Fair Value	1,027	1,013
Held to maturity, Subtotal, Fair Value	5,324	5,550
Held to maturity, Mortgage backed securities, Fair Value	1,983	2,039
Held-to-maturity Securities	6,982us-gaap_HeldToMaturitySecurities	7,331us-gaap_HeldToMaturitySecurities
Held to maturity, Fair Value	$ 7,307	$ 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 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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