Revenues (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Contract with customer, liability [Abstract]
Contract with customer liability	$ 147		$ 124
Revenue recognized included in beginning contract liability	Revenue recognized in each reporting period, included in the contract liability balance at the beginning of the period, was immaterial.	Revenue recognized in each reporting period, included in the contract liability balance at the beginning of the period, was immaterial.