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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Fair Value 0-12 months | $ 5,111 | $ 34,952
Gross unrealized (loss) 0-12 months | (88) | (953)
Fair Value over 12 months | 4,239 | 27,762
Gross unrealized (loss) over 12 months | (120) | (817)
Fair Value | 9,350 | 62,714
Gross unrealized (loss) | (208) | (1,770)
U.S. Treasury and agency |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 144 | 523
Gross unrealized (loss) 0-12 months | 0 | (4)
Fair Value over 12 months | 531 | 2,859
Gross unrealized (loss) over 12 months | (1) | (50)
Fair Value | 675 | 3,382
Gross unrealized (loss) | (1) | (54)
Foreign |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 1,077 | 6,764
Gross unrealized (loss) 0-12 months | (23) | (208)
Fair Value over 12 months | 1,014 | 5,349
Gross unrealized (loss) over 12 months | (46) | (159)
Fair Value | 2,091 | 12,113
Gross unrealized (loss) | (69) | (367)
Corporate securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 2,600 | 16,538
Gross unrealized (loss) 0-12 months | (62) | (599)
Fair Value over 12 months | 1,095 | 4,873
Gross unrealized (loss) over 12 months | (50) | (255)
Fair Value | 3,695 | 21,411
Gross unrealized (loss) | (112) | (854)
Mortgage-backed securities |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 640 | 6,103
Gross unrealized (loss) 0-12 months | (2) | (98)
Fair Value over 12 months | 1,228 | 6,913
Gross unrealized (loss) over 12 months | (11) | (229)
Fair Value | 1,868 | 13,016
Gross unrealized (loss) | (13) | (327)
States, municipalities, and political subdivisions |  |
Investment [Line Items] |  |
Fair Value 0-12 months | 650 | 5,024
Gross unrealized (loss) 0-12 months | (1) | (44)
Fair Value over 12 months | 371 | 7,768
Gross unrealized (loss) over 12 months | (12) | (124)
Fair Value | 1,021 | 12,792
Gross unrealized (loss) | $ (13) | $ (168)

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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