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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Amortized Cost | $ 3,736 | $ 3,164
Available for sale, Due after 1 year through 5 years, Amortized Cost | 26,694 | 24,749
Available for sale, Due after 5 years though 10 years, Amortized Cost | 23,638 | 25,388
Available for sale, Due after 10 years, Amortized Cost | 8,174 | 9,255
Available for sale, Mortgage-backed securities, Amortized Cost | 16,395 | 15,279
Available for sale, at amortized cost | 78,637 | 77,835
Available for sale, Due in 1 year or less, Fair Value | 3,742 | 3,182
Available for sale, Due after 1 year through 5 years, Fair Value | 26,646 | 25,068
Available for sale, Due after 5 years through 10 years, Fair Value | 23,325 | 25,704
Available for sale, Due after 10 years, Fair Value | 8,242 | 9,695
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 62,242 | 62,556
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 61,955 | 63,649
Available for sale, Mortgage backed securities, Fair Value | 15,898 | 15,290
Available for sale, Fair Value | 77,853 | 78,939
Held to maturity, Due in 1 year or less, Amortized Cost | 567 | 743
Held to maturity, Due after 1 year through 5 years, Amortized Cost | 2,959 | 2,669
Held to maturity, Due after 5 years through 10 years, Amortized Cost | 4,507 | 4,744
Held to maturity, Due after 10 years, Amortized Cost | 2,956 | 3,455
Held to maturity, Mortgage backed securities, Amortized Cost | 2,574 | 2,724
Held to maturity, Amortized Cost | 13,563 | 14,335
Held to maturity, Due in 1 year or less, Fair Value | 569 | 746
Held to maturity, Due after 1 year through 5, Fair Value | 2,925 | 2,688
Held to maturity, Due after 5 years through 10 years, Fair Value | 4,400 | 4,756
Held to maturity, Due after 10 years, Fair Value | 2,887 | 3,542
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 10,989 | 11,611
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,781 | 11,732
Held to maturity, Mortgage backed securities, Fair Value | 2,503 | 2,742
Held to maturity, Fair Value | $ 13,284 | $ 14,474

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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