Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive (Loss) Income
Net (loss) income	$ (1,264)	$ 58	$ 68
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	4	7	(2)
Net (loss) gain on hedge of net investment in foreign operations	(23)		5
Unrealized loss on derivatives designated as cash flow hedges	(7)	(3)	(8)
Change in pension and other postretirement benefit plans	(5)	(14)	(8)
Other comprehensive loss, net of tax	(31)	(10)	(13)
Comprehensive (loss) income, net of tax	$ (1,295)	$ 48	$ 55