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Income Taxes - Unrecognized Tax Benefits Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Income Tax Contingency [Line Items]      
Unrecognized tax benefits $ 15 $ 15 $ 14
Unrecognized tax benefits that would impact effective tax rate 8 8 7
Unrecognized tax benefits, increase from related party transactions   2  
Income tax expense and related amounts accrued 2 2 $ 2
Liability for uncertainty in income taxes, noncurrent 7 7  
Tax audit appeals refund 9    
Tax audit appeals, refund, labor related tax debts 2    
Domestic Country And Foreign Country Witholding Taxes      
Income Tax Contingency [Line Items]      
Liability for uncertainty in income taxes, noncurrent 3 3  
Worldwide      
Income Tax Contingency [Line Items]      
Tax audit appeals and refund claims receivable $ 5 $ 5