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Income Taxes - Income Tax Provision Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Examination [Line Items]        
Provision for income taxes $ 4 $ 12 $ 20 $ 19
Pretax losses from continuing operations $ (11) $ (22) $ (35) 49
Minimum        
Income Tax Examination [Line Items]        
Valuation allowance release period     9 months  
Maximum        
Income Tax Examination [Line Items]        
Valuation allowance release period     24 months  
Jurisdictions where valuation allowances are maintained        
Income Tax Examination [Line Items]        
Pretax losses from continuing operations     $ 48 $ 106