Revenue - Narrative (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net sales	$ 535,000,000	$ 526,000,000	$ 572,000,000	$ 594	$ 593,000,000	$ 567,000,000	$ 579,000,000	$ 583,000,000	$ 2,228,000,000	$ 2,322,000,000	$ 2,218,000,000
Capitalized contract costs	54,000,000				$ 23,000,000				54,000,000	23,000,000
Non-US
Disaggregation of Revenue [Line Items]
Net sales									356,000,000	$ 159,000,000	$ 222,000,000
Direct And Incremental Costs
Disaggregation of Revenue [Line Items]
Capitalized contract costs	$ 12,000,000								$ 12,000,000