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Accounts Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accounts Receivable Details [Abstract]          
Allowance for doubtful accounts $ 20   $ 20   $ 4
Allowance for doubtful accounts - receivables not expected to be collected in one year 44   44   35
Receivables Securitization Facility [Abstract]          
Total capacity to transfer undivided interests to investors under the receivables securitization facility 800   $ 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   400
Accounts receivable supporting the undivided interest held by investors 1,100   1,100   $ 1,300
Cost of the receivables securitization facility - interest expense $ 1 $ 3 $ 4 $ 7