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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]      
Interest and penalties accrued (less than) $ 1 $ 1 $ 1
Minimum      
Income Tax Contingency [Line Items]      
Amount unrecognized tax benefits that it is reasonably possible will increase (decrease) in the next twelve months (2)    
Maximum      
Income Tax Contingency [Line Items]      
Amount unrecognized tax benefits that it is reasonably possible will increase (decrease) in the next twelve months $ 2