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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