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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Consignment inventory $ 7 $ 12  
Accrued rebates $ 44 $ 34  
All Customers [Member] [Member]      
Disaggregation of Revenue [Line Items]      
Concentration Risk, Percentage 46.00% 42.00% 44.00%