Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 427	$ 254	$ 401
Other comprehensive loss, before tax:
Foreign currency translation adjustment	20	(23)	28
Net change in derivative hedge agreements:
Unrealized gain (loss)	(10)	9	(14)
Amount of (gain) loss reclassified into net income	4	(3)	12
Net change in post-retirement benefit plans:
Net gain (loss)	51	(78)	(83)
Prior service credit	0	5	0
Amortization of prior service credit cost	(3)	(3)	(4)
Amortization of net actuarial loss into net income	23	19	12
Settlement	0	0	9
Foreign currency translation adjustment	11	(19)	(3)
Other comprehensive income (loss), before tax	96	(93)	(43)
Income tax (benefit) expense related to other comprehensive loss	54	(54)	(5)
Other comprehensive income (loss), net of tax	42	(39)	(38)
Comprehensive income	469	215	363
Less: comprehensive (loss) gain attributable to noncontrolling interests	0	(1)	1
Comprehensive income	$ 469	$ 216	$ 362