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Accounts and Notes Receivable, Net - (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]      
Bad debt expense $ 3,000,000    
Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Bad debt expense   $ 1,000,000 $ 1,000,000