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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Dec. 31, 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 | $ 3,569 | $ 3,164
Available for sale, Due after 1 year through 5 years, Amortized Cost | 27,134 | 24,749
Available for sale, Due after 5 years though 10 years, Amortized Cost | 24,095 | 25,388
Available for sale, Due after 10 years, Amortized Cost | 8,767 | 9,255
Available for sale, Mortgage-backed securities, Amortized Cost | 15,758 | 15,279
Debt Securities, Available-for-sale, Amortized Cost | 79,323 | 77,835
Available for sale, Due in 1 year or less, Fair Value | 3,568 | 3,182
Available for sale, Due after 1 year through 5 years, Fair Value | 27,005 | 25,068
Available for sale, Due after 5 years through 10 years, Fair Value | 23,543 | 25,704
Available for sale, Due after 10 years, Fair Value | 8,814 | 9,695
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 63,565 | 62,556
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 62,930 | 63,649
Available for sale, Mortgage backed securities, Fair Value | 15,540 | 15,290
Available for sale, Fair Value | 78,470 | 78,939
Held to maturity, Due in 1 year or less, Amortized Cost | 536 | 743
Held to maturity, Due after 1 year through 5 years, Amortized Cost | 3,122 | 2,669
Held to maturity, Due after 5 years through 10 years, Amortized Cost | 4,468 | 4,744
Held to maturity, Due after 10 years, Amortized Cost | 2,785 | 3,455
Held to maturity, Mortgage backed securities, Amortized Cost | 2,524 | 2,724
Debt Securities, Held-to-maturity | 13,435 | 14,335
Held to maturity, Due in 1 year or less, Fair Value | 537 | 746
Held to maturity, Due after 1 year through 5, Fair Value | 3,106 | 2,688
Held to maturity, Due after 5 years through 10 years, Fair Value | 4,407 | 4,756
Held to maturity, Due after 10 years, Fair Value | 2,723 | 3,542
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 10,911 | 11,611
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,773 | 11,732
Held to maturity, Mortgage backed securities, Fair Value | 2,486 | 2,742
Held to maturity, Fair Value | $ 13,259 | $ 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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