Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 1,896	$ 1,992	$ 858
Other comprehensive income (loss), net of tax
Foreign currency translation	(11)	(8)	(16)
Gain (loss) on cash flow hedges	13	(18)	(30)
Pension and postretirement benefits	(3)	(2)	(7)
Total other comprehensive income (loss), net of tax	(1)	(28)	(53)
Total comprehensive income (loss), net of tax	1,895	1,964	805
Comprehensive (income) loss attributable to noncontrolling interests	(6)	(7)	(6)
Comprehensive income (loss) attributable to Celanese Corporation	$ 1,889	$ 1,957	$ 799