Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock, Common	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, 2020		114,168,464	55,234,515
Balance as of the beginning of the period at Dec. 31, 2020		$ 0	$ (4,494)	$ 257	$ 8,091	$ (328)
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 option exercises, shares		0
Stock option exercises, net of tax		$ 0
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)
Balance as of the beginning of the period, noncontrolling interest at Dec. 31, 2020							$ 369
Net earnings (loss) attributable to noncontrolling interests	(6)						(6)
Distributions/dividends to noncontrolling interests							27
Acquisition of noncontrolling interests							0
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2021							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 option exercises, shares		0
Stock option exercises, net of tax		$ 0
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/dividends to noncontrolling interests							13
Acquisition of noncontrolling interests							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
Purchases of treasury stock (in shares)	0	0	0
Purchases of treasury stock	$ 0	$ 0	$ 0
Stock awards (in shares)		431,526
Stock awards		$ 0
Issuance of treasury stock under stock plans (in shares)			(91,179)
Issuance of treasury stock under stock plans			$ 3
Balance as of the end of the period (in shares) at Dec. 31, 2023		108,906,426	61,570,314
Balance as of the end of the period at Dec. 31, 2023	7,091	$ 0	$ (5,488)	394	12,929	(744)
Stock option exercises, shares		968
Stock option exercises, net of tax		$ 0
Stock-based compensation, net of tax				$ 22
Net earnings (loss) attributable to Celanese Corporation	1,960				1,960
Common stock dividends					$ (305)
Other comprehensive income (loss), net of tax	(226)					$ (226)
Net earnings (loss) attributable to noncontrolling interests	(4)						(4)
Distributions/dividends to noncontrolling interests							11
Acquisition of noncontrolling interests							0
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2023	461						$ 461
Balance as of the end of the period at Dec. 31, 2023	$ 7,552