Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 356	$ (4,957)
Postretirement and postemployment plans
Change in actuarial loss and other	4	4
Income tax provision	0	0
Postretirement and postemployment plans, net of tax	4	4
Foreign currency hedges
Net recognized gain reclassified to discontinued operations	0	34
Income tax benefit (provision)	0	(4)
Foreign currency hedges, net of tax	0	30
Other, net of tax	0	1
Other comprehensive income (loss)	4	35
Comprehensive income (loss)	$ 360	$ (4,922)