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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Available for sale, Due in 1 year or less, Amortized Cost | $ 3,776 | $ 3,569
Available for sale, Due after 1 year through 5 years, Amortized Cost | 27,308 | 27,134
Available for sale, Due after 5 years though 10 years, Amortized Cost | 23,367 | 24,095
Available for sale, Due after 10 years, Amortized Cost | 8,804 | 8,767
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 63,255 | 63,565
Available for sale, Mortgage-backed securities, Amortized Cost | 16,369 | 15,758
Available for sale, at amortized cost | 79,624 | 79,323
Available for sale, Due in 1 year or less, Fair Value | 3,785 | 3,568
Available for sale, Due after 1 year through 5 years, Fair Value | 27,593 | 27,005
Available for sale, Due after 5 years through 10 years, Fair Value | 23,690 | 23,543
Available for sale, Due after 10 years, Fair Value | 9,165 | 8,814
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 64,233 | 62,930
Available for sale, Mortgage backed securities, Fair Value | 16,430 | 15,540
Available for sale, Fair Value | 80,663 | 78,470
Held to maturity, Due in 1 year or less, Amortized Cost | 614 | 536
Held to maturity, Due after 1 year through 5 years, Amortized Cost | 3,111 | 3,122
Held to maturity, Due after 5 years through 10 years, Amortized Cost | 4,246 | 4,468
Held to maturity, Due after 10 years, Amortized Cost | 2,681 | 2,785
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 10,652 | 10,911
Held to maturity, Mortgage backed securities, Amortized Cost | 2,484 | 2,524
Held to maturity, Amortized Cost | 13,136 | 13,435
Held to maturity, Due in 1 year or less, Fair Value | 616 | 537
Held to maturity, Due after 1 year through 5, Fair Value | 3,125 | 3,106
Held to maturity, Due after 5 years through 10 years, Fair Value | 4,287 | 4,407
Held to maturity, Due after 10 years, Fair Value | 2,718 | 2,723
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 10,746 | 10,773
Held to maturity, Mortgage backed securities, Fair Value | 2,494 | 2,486
Held to maturity, Fair Value | $ 13,240 | $ 13,259

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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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