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Income Taxes - Income Tax Provision Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Examination [Line Items]        
Provision for income taxes $ 4 $ 2 $ 16 $ 7
Pretax losses from continuing operations $ (7) $ (40) 24 (71)
Jurisdictions where valuation allowances are maintained        
Income Tax Examination [Line Items]        
Pretax losses from continuing operations     $ 34 $ 101