Accounts Receivable (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 28, 2019
Accounts Receivable Details [Abstract]
Allowance for doubtful accounts	$ 4	$ 4	$ 3
Allowance for doubtful accounts - receivables not expected to be collected in one year	35	35	27
Receivables Securitization Facility [Abstract]
Total capacity to transfer undivided interests to investors under the receivables securitization facility	$ 800	800			$ 650
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	$ 1,300	1,300	1,400
Cost of the receivables securitization facility - interest expense		$ 14	$ 15	$ 6