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Description of Business and Significant Accounting Policies - Effect of Adoption of ASU 2016-02 As Reported (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Operating lease right-of-use asset | $ 59,000,000 | $ 0
Operating lease liabilities | 16,000,000 | 0
Operating lease liabilities, noncurrent | 54,000,000 | 0
Accumulated deficit | (245,000,000) | $ (266,000,000)
Balance Using Previous Standard |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Operating lease right-of-use asset | 0 |
Operating lease liabilities | 0 |
Operating lease liabilities, noncurrent | 11,000,000 |
Accumulated deficit | (245,000,000) |
Accounting Standards Update 2016-02 | Increase (Decrease) |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Operating lease right-of-use asset | 59,000,000 |
Operating lease liabilities | 16,000,000 |
Operating lease liabilities, noncurrent | 43,000,000 |
Accumulated deficit | $ 0 |

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