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Accounts Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accounts Receivable Details [Abstract]      
Allowance for doubtful accounts $ 22   $ 4
Allowance for doubtful accounts - receivables not expected to be collected in one year 38   35
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 $ 400   400
Accounts receivable supporting the undivided interest held by investors 1,400   $ 1,300
Cost of the receivables securitization facility - interest expense $ 3 $ 4