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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Fair Value 0-12 months | $ 3,954 | $ 34,952
Gross unrealized (loss) 0-12 months | (64) | (953)
Fair Value over 12 months | 8,958 | 27,762
Gross unrealized (loss) over 12 months | (162) | (817)
Fair Value | 12,912 | 62,714
Gross unrealized (loss) | (226) | (1,770)
U.S. Treasury and agency |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 41 | 523
Gross unrealized (loss) 0-12 months | 0 | (4)
Fair Value over 12 months | 836 | 2,859
Gross unrealized (loss) over 12 months | (3) | (50)
Fair Value | 877 | 3,382
Gross unrealized (loss) | (3) | (54)
Foreign |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 946 | 6,764
Gross unrealized (loss) 0-12 months | (14) | (208)
Fair Value over 12 months | 2,042 | 5,349
Gross unrealized (loss) over 12 months | (58) | (159)
Fair Value | 2,988 | 12,113
Gross unrealized (loss) | (72) | (367)
Corporate securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 2,617 | 16,538
Gross unrealized (loss) 0-12 months | (49) | (599)
Fair Value over 12 months | 1,834 | 4,873
Gross unrealized (loss) over 12 months | (57) | (255)
Fair Value | 4,451 | 21,411
Gross unrealized (loss) | (106) | (854)
Mortgage-backed securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 289 | 6,103
Gross unrealized (loss) 0-12 months | (1) | (98)
Fair Value over 12 months | 2,779 | 6,913
Gross unrealized (loss) over 12 months | (28) | (229)
Fair Value | 3,068 | 13,016
Gross unrealized (loss) | (29) | (327)
States, municipalities, and political subdivisions |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 61 | 5,024
Gross unrealized (loss) 0-12 months | 0 | (44)
Fair Value over 12 months | 1,467 | 7,768
Gross unrealized (loss) over 12 months | (16) | (124)
Fair Value | 1,528 | 12,792
Gross unrealized (loss) | $ (16) | $ (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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