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Investments - Investments With a Continuous Realized Loss Position (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 141 | $ 5
12 months or more | 0 | 24
Total | 141 | 29
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | 0 | 0
Total | 0 | 0
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 25 |
12 months or more | 0 |
Total | 25 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
Corporate bonds |  |
Fair Value |  |
Less than 12 months | 84 |
12 months or more | 0 |
Total | 84 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
U.S. government agencies and government- sponsored agencies |  |
Fair Value |  |
Less than 12 months | 4 |
12 months or more | 0 |
Total | 4 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
U.S. treasuries |  |
Fair Value |  |
Less than 12 months | 21 | 5
12 months or more | 0 | 24
Total | 21 | 29
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | 0 | 0
Total | 0 | $ 0
Other debt securities |  |
Fair Value |  |
Less than 12 months | 7 |
12 months or more | 0 |
Total | 7 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | $ 0 |

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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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