Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net	Noncontrolling Interests
Balance as of the beginning of the period (in shares) at Dec. 31, 2019		119,555,207	49,417,965
Balance as of the beginning of the period at Dec. 31, 2019		$ 0	$ (3,846)	$ 254	$ 6,399	$ (300)
Purchases of treasury stock (in shares)	5,889,073	5,889,073	(5,889,073)
Purchases of treasury stock	$ (650)	$ 0	$ (650)
Stock awards (in shares)		502,330
Stock awards		$ 0
Issuance of treasury stock under stock plans (in shares)			(72,523)
Issuance of treasury stock under stock plans			$ 2
Balance as of the end of the period (in shares) at Dec. 31, 2020		114,168,464	55,234,515
Balance as of the end of the period at Dec. 31, 2020	3,526	$ 0	$ (4,494)	257	8,091	(328)
Stock-based compensation, net of tax				3
Net earnings (loss) attributable to Celanese Corporation	1,985				1,985
Common stock dividends					(293)
Other comprehensive income (loss), net of tax	(28)					(28)
Balance as of the beginning of the period, noncontrolling interest at Dec. 31, 2019							$ 391
Net earnings (loss) attributable to noncontrolling interests	(7)						(7)
(Distributions to) contributions from noncontrolling interests							29
Acquisition of noncontrolling interest							0
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2020							369
Balance as of the end of the period at Dec. 31, 2020	$ 3,895
Purchases of treasury stock (in shares)	6,556,378	6,556,378	(6,556,378)
Purchases of treasury stock	$ (1,000)	$ 0	$ (1,000)
Stock awards (in shares)		411,649
Stock awards		$ 0
Issuance of treasury stock under stock plans (in shares)			(54,604)
Issuance of treasury stock under stock plans			$ 2
Balance as of the end of the period (in shares) at Dec. 31, 2021		108,023,735	61,736,289
Balance as of the end of the period at Dec. 31, 2021	4,189	$ 0	$ (5,492)	333	9,677	(329)
Stock-based compensation, net of tax				76
Net earnings (loss) attributable to Celanese Corporation	1,890				1,890
Common stock dividends					(304)
Other comprehensive income (loss), net of tax	(1)					(1)
Net earnings (loss) attributable to noncontrolling interests	(6)						(6)
(Distributions to) contributions from noncontrolling interests							27
Acquisition of noncontrolling interest							0
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2021	348						348
Balance as of the end of the period at Dec. 31, 2021	$ 4,537
Purchases of treasury stock (in shares)	0	0	0
Purchases of treasury stock	$ 0	$ 0	$ 0
Stock awards (in shares)		450,197
Stock awards		$ 0
Issuance of treasury stock under stock plans (in shares)			(74,796)
Issuance of treasury stock under stock plans			$ 1
Balance as of the end of the period (in shares) at Dec. 31, 2022		108,473,932	61,661,493
Balance as of the end of the period at Dec. 31, 2022	5,637	$ 0	$ (5,491)	372	11,274	(518)
Stock-based compensation, net of tax				$ 39
Net earnings (loss) attributable to Celanese Corporation	1,894				1,894
Common stock dividends					$ (297)
Other comprehensive income (loss), net of tax	(189)					$ (189)
Net earnings (loss) attributable to noncontrolling interests	(8)						(8)
(Distributions to) contributions from noncontrolling interests							13
Acquisition of noncontrolling interest							125
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2022	468						$ 468
Balance as of the end of the period at Dec. 31, 2022	$ 6,105