Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,735	$ 3,164
Available for sale, Due after 1 year through 5 years, Amortized Cost	25,140	24,749
Available for sale, Due after 5 years though 10 years, Amortized Cost	25,243	25,388
Available for sale, Due after 10 years, Amortized Cost	8,974	9,255
Available for sale, Subtotal, Amortized Cost	63,092	62,556
Available for sale, Mortgage-backed securities, Amortized Cost	16,116	15,279
Available for sale, at amortized cost	79,208	77,835
Available for sale, Due in 1 year or less, Fair Value	3,746	3,182
Available for sale, Due after 1 year through 5 years, Fair Value	25,251	25,068
Available for sale, Due after 5 years through 10 years, Fair Value	25,097	25,704
Available for sale, Due after 10 years, Fair Value	9,197	9,695
Available for sale, Subtotal, Fair Value	63,291	63,649
Available for sale, Mortgage backed securities, Fair Value	15,820	15,290
Available for sale, Fair Value	79,111	78,939
Held to maturity, Due in 1 year or less, Amortized Cost	838	743
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,684	2,669
Held to maturity, Due after 5 years through 10 years, Amortized Cost	4,713	4,744
Held to maturity, Due after 10 years, Amortized Cost	3,337	3,455
Held to maturity, Subtotal, Amortized Cost	11,572	11,611
Held to maturity, Mortgage backed securities, Amortized Cost	2,681	2,724
Held to maturity, Amortized Cost	14,253	14,335
Held to maturity, Due in 1 year or less, Fair Value	840	746
Held to maturity, Due after 1 year through 5, Fair Value	2,678	2,688
Held to maturity, Due after 5 years through 10 years, Fair Value	4,635	4,756
Held to maturity, Due after 10 years, Fair Value	3,322	3,542
Held to maturity, Subtotal, Fair Value	11,475	11,732
Held to maturity, Mortgage backed securities, Fair Value	2,647	2,742
Held to maturity, Fair Value	$ 14,122	$ 14,474

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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Fair value of held-to-maturity 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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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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