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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Fair Value 0-12 months | $ 5,544 | $ 34,952
Gross unrealized (loss) 0-12 months | (89) | (953)
Fair Value over 12 months | 26,573 | 27,762
Gross unrealized (loss) over 12 months | (406) | (817)
Fair Value | 32,117 | 62,714
Gross unrealized (loss) | (495) | (1,770)
U.S. Treasury and agency |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 68 | 523
Gross unrealized (loss) 0-12 months | 0 | (4)
Fair Value over 12 months | 2,298 | 2,859
Gross unrealized (loss) over 12 months | (22) | (50)
Fair Value | 2,366 | 3,382
Gross unrealized (loss) | (22) | (54)
Foreign |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 1,346 | 6,764
Gross unrealized (loss) 0-12 months | (26) | (208)
Fair Value over 12 months | 4,228 | 5,349
Gross unrealized (loss) over 12 months | (89) | (159)
Fair Value | 5,574 | 12,113
Gross unrealized (loss) | (115) | (367)
Corporate securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 3,649 | 16,538
Gross unrealized (loss) 0-12 months | (62) | (599)
Fair Value over 12 months | 6,206 | 4,873
Gross unrealized (loss) over 12 months | (142) | (255)
Fair Value | 9,855 | 21,411
Gross unrealized (loss) | (204) | (854)
Mortgage-backed securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 388 | 6,103
Gross unrealized (loss) 0-12 months | (1) | (98)
Fair Value over 12 months | 8,974 | 6,913
Gross unrealized (loss) over 12 months | (117) | (229)
Fair Value | 9,362 | 13,016
Gross unrealized (loss) | (118) | (327)
States, municipalities, and political subdivisions |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 93 | 5,024
Gross unrealized (loss) 0-12 months | 0 | (44)
Fair Value over 12 months | 4,867 | 7,768
Gross unrealized (loss) over 12 months | (36) | (124)
Fair Value | 4,960 | 12,792
Gross unrealized (loss) | $ (36) | $ (168)

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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