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Description of Business and Significant Accounting Policies - Effect of Adoption of ASU 2016-02 As Reported (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Operating lease right-of-use asset | $ 57 | $ 0
Operating lease liabilities | 17 | 0
Operating lease liabilities, noncurrent | 52 | 0
Accumulated deficit | (200) | $ (266)
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 | 10 |
Accumulated deficit | (200) |
Accounting Standards Update 2016-02 | Increase (Decrease) |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Operating lease right-of-use asset | 57 |
Operating lease liabilities | 17 |
Operating lease liabilities, noncurrent | 42 |
Accumulated deficit | $ 0 |

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