Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - 10-K - Accumulated Other Comprehensive Income (Loss) (Details)

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Summary of Significant Accounting Policies - 10-K - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ (deficit) equity $ (736) $ (1,817) $ (1,522) $ (792)
Foreign currency translation adjustment, net of tax 14 (29) 19  
Foreign currency translation adjustment, tax (5)      
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ (deficit) equity $ 8 $ (6) $ 19 $ 0