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, 2021		108,023,735	61,736,289
Balance as of the beginning of the period at Dec. 31, 2021		$ 0	$ (5,492)	$ 333	$ 9,677	$ (329)
Stock option exercises (in shares)		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
Stock option exercises, net of tax		$ 0		0
Net earnings (loss) attributable to Celanese Corporation	1,894				1,894
Common stock dividends					(297)
Other comprehensive income (loss), net of tax	(189)					(189)	$ 0
Balance as of the beginning of the period, noncontrolling interest at Dec. 31, 2021							348
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
Balance as of the end of the period at Dec. 31, 2022	6,105
Stock option exercises (in shares)		968
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-based compensation, net of tax				22
Stock option exercises, net of tax		$ 0		0
Net earnings (loss) attributable to Celanese Corporation	1,960				1,960
Common stock dividends					(305)
Other comprehensive income (loss), net of tax	(226)					(226)	0
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
Stock option exercises (in shares)		10,088
Stock awards (in shares)		411,042
Stock awards		$ 0
Issuance of treasury stock under stock plans (in shares)			(70,674)
Issuance of treasury stock under stock plans			$ 2
Balance as of the end of the period (in shares) at Dec. 31, 2024		109,327,556	61,499,640
Balance as of the end of the period at Dec. 31, 2024	5,175	$ 0	$ (5,486)	409	11,100	(848)
Stock-based compensation, net of tax				14
Stock option exercises, net of tax		$ 0		$ 1
Net earnings (loss) attributable to Celanese Corporation	(1,522)				(1,522)
Common stock dividends					$ (307)
Other comprehensive income (loss), net of tax	(104)					$ (104)	(2)
Net earnings (loss) attributable to noncontrolling interests	(8)						(8)
Distributions/dividends to noncontrolling interests							33
Acquisition of noncontrolling interests							0
Balance as of the end of the period, noncontrolling interest at Dec. 31, 2024	434						$ 434
Balance as of the end of the period at Dec. 31, 2024	$ 5,609