Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,532	$ 3,892
Available for sale, Due after 1 year through 5 years, Amortized Cost	24,918	24,027
Available for sale, Due after 5 years though 10 years, Amortized Cost	28,009	27,262
Available for sale, Due after 10 years, Amortized Cost	10,426	10,289
Available for sale, Subtotal, Amortized Cost	66,885	65,470
Available for sale, Mortgage-backed securities, Amortized Cost	15,369	14,066
Available for sale, at amortized cost	82,254	79,536
Available for sale, Due in 1 year or less, Fair Value	3,556	3,913
Available for sale, Due after 1 year through 5 years, Fair Value	25,397	24,429
Available for sale, Due after 5 years through 10 years, Fair Value	28,488	27,379
Available for sale, Due after 10 years, Fair Value	10,834	10,387
Available for sale, Subtotal, Fair Value	68,275	66,108
Available for sale, Mortgage backed securities, Fair Value	15,411	14,007
Available for sale, Fair Value	83,686	80,115
Held to maturity, Due in 1 year or less, Amortized Cost	822	430
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,479	2,646
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,821	2,969
Held to maturity, Due after 10 years, Amortized Cost	2,815	3,206
Held to maturity, Subtotal, Amortized Cost	8,937	9,251
Held to maturity, Mortgage backed securities, Amortized Cost	1,223	1,393
Held to maturity, Amortized Cost	10,160	10,644
Held to maturity, Due in 1 year or less, Fair Value	828	435
Held to maturity, Due after 1 year through 5, Fair Value	2,524	2,691
Held to maturity, Due after 5 years through 10 years, Fair Value	2,866	2,944
Held to maturity, Due after 10 years, Fair Value	2,889	3,172
Held to maturity, Subtotal, Fair Value	9,107	9,242
Held to maturity, Mortgage backed securities, Fair Value	1,258	1,428
Held to maturity, Fair Value	$ 10,365	$ 10,670

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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