Supplemental Financial Information - Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Interest Income Expense Net
Interest expense, net of capitalized interest	$ 30	$ 25
Interest income	(9)	(7)
Interest expense, net	$ 21	$ 18

Amount of the cost of borrowed funds accounted for as interest expense.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration