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Investments - Investments With a Continuous Realized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 145 | $ 5
12 months or more | 0 | 24
Total | 145 | 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 | 26 |
12 months or more | 0 |
Total | 26 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
Corporate bonds |  |
Fair Value |  |
Less than 12 months | 72 |
12 months or more | 0 |
Total | 72 |
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 | 7 |
12 months or more | 0 |
Total | 7 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
U.S. treasuries |  |
Fair Value |  |
Less than 12 months | 31 | 5
12 months or more | 0 | 24
Total | 31 | 29
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | 0 | 0
Total | 0 | $ 0
Exchange Traded Fund |  |
Fair Value |  |
Less than 12 months | 1 |
12 months or more | 0 |
Total | 1 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | 0 |
Other debt securities |  |
Fair Value |  |
Less than 12 months | 8 |
12 months or more | 0 |
Total | 8 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | 0 |
Total | $ 0 |

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