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Investments - Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2018 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 2,279
Fair value | $ 2,409
Unrealized losses | $ 36
U.S. government securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 8
Fair value | $ 26
Unrealized losses | $ 0
States, municipalities and political subdivisions |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 54
Fair value | $ 86
Unrealized losses | $ 1
U.S. corporate securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 1,399
Fair value | $ 1,431
Unrealized losses | $ 16
Foreign securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 243
Fair value | $ 314
Unrealized losses | $ 3
Residential mortgage-backed securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 45
Fair value | $ 1
Unrealized losses | $ 0
Other asset-backed securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 516
Fair value | $ 528
Unrealized losses | $ 15
Redeemable preferred securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities | security | 14
Fair value | $ 23
Unrealized losses | $ 1

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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