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Accounts Receivable (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable Details [Abstract]      
Allowance for doubtful accounts $ 17,000,000 $ 4,000,000  
Allowance for doubtful accounts - receivables not expected to be collected in one year 51,000,000 35,000,000  
Receivables Securitization Facility [Abstract]      
Total capacity to transfer undivided interests to investors under the receivables securitization facility $ 800,000,000    
Receivables securitization facility maturity date 2022-07    
Receivables securitization facility duration 3 years    
Value of the outstanding undivided interest held by investors under the receivables securitization facility $ 0 400,000,000  
Accounts receivable supporting the undivided interest held by investors 1,200,000,000 1,300,000,000  
Cost of the receivables securitization facility - interest expense $ 7,000,000 $ 14,000,000 $ 15,000,000