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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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- Definition 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 following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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