Consolidated Statement of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
NET (LOSS) INCOME	$ (445)	$ (5)	$ (561)	$ 178
Other comprehensive income (loss), net of tax:
Currency translation adjustments	(1)	(2)	(17)	2
Pension and other postretirement benefit plan obligation activity, net of tax	3	(1)	15	(2)
Other comprehensive income (loss), net of tax	2	(3)	(2)
COMPREHENSIVE (LOSS) INCOME, NET OF TAX	$ (443)	$ (8)	$ (563)	$ 178