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Accounts Receivable (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Apr. 12, 2021
Dec. 31, 2020
Accounts Receivable Details [Abstract]        
Allowance for doubtful accounts $ 17     $ 17
Allowance for doubtful accounts - receivables not expected to be collected in one year 43     51
Receivables Securitization Facility [Abstract]        
Total capacity to transfer undivided interests to investors under the receivables securitization facility $ 800      
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     0
Accounts receivable supporting the undivided interest held by investors 1,300     $ 1,200
Cost of the receivables securitization facility - interest expense $ 1 $ 3    
Subsequent Event [Member]        
Receivables Securitization Facility [Abstract]        
Value of the outstanding undivided interest held by investors under the receivables securitization facility     $ 400