Segment Data - Reconciliation of Operating Results (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total operating income	$ (9)	$ 32
Other income, net	(9)	2
Income (expense) before taxes and equity in earnings of affiliates	(18)	34
Operating Segments
Segment Reporting Information [Line Items]
Total operating income	21	45
Corporate
Segment Reporting Information [Line Items]
Total operating income	$ (30)	$ (13)