Unaudited Interim Consolidated Statement Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net	Noncontrolling Interests	Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Celanese Corporation stockholders' equity		$ 0	$ 333	$ 9,677	$ (329)		$ (5,492)
Balance as of the beginning of the period (in shares) at Dec. 31, 2021		108,023,735					61,736,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of tax			11
Purchases of treasury stock (in shares)	0
Issuance of treasury stock under stock plans							$ 0
Issuance of treasury stock under stock plans (in shares)							(32,243)
Stock awards (in shares)		322,300
Stock awards		$ 0
Net earnings (loss) attributable to Celanese Corporation	$ 936			936
Common stock dividends				(147)
Other comprehensive income (loss), net of tax	(109)				(109)
Balance as of the beginning of the period, noncontrolling interest at Dec. 31, 2021						$ 348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	4					4
Distributions/dividends to noncontrolling interests						(7)
Balance as of the end of the period, noncontrolling interest at Jun. 30, 2022						345
Balance as of the end of the period (in shares) at Jun. 30, 2022		108,346,035					61,704,046
Balance as of the end of the period at Jun. 30, 2022	5,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Celanese Corporation stockholders' equity		$ 0	326	10,106	(333)		$ (5,492)
Balance as of the beginning of the period (in shares) at Mar. 31, 2022		108,307,341					61,736,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of tax			18
Issuance of treasury stock under stock plans							$ 0
Issuance of treasury stock under stock plans (in shares)							(32,243)
Stock awards (in shares)		38,694
Stock awards		$ 0
Net earnings (loss) attributable to Celanese Corporation	434			434
Common stock dividends				(74)
Other comprehensive income (loss), net of tax	(105)				(105)
Balance as of the beginning of the period, noncontrolling interest at Mar. 31, 2022						346
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	2					2
Distributions/dividends to noncontrolling interests						(3)
Balance as of the end of the period, noncontrolling interest at Jun. 30, 2022						345
Balance as of the end of the period (in shares) at Jun. 30, 2022		108,346,035					61,704,046
Balance as of the end of the period at Jun. 30, 2022	5,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Celanese Corporation stockholders' equity	4,880	$ 0	344	10,466	(438)		$ (5,492)
Celanese Corporation stockholders' equity	5,637	$ 0	372	11,274	(518)		$ (5,491)
Balance as of the beginning of the period (in shares) at Dec. 31, 2022		108,473,932					61,661,493
Balance as of the beginning of the period at Dec. 31, 2022	$ 6,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of tax			11
Purchases of treasury stock (in shares)	0
Issuance of treasury stock under stock plans							$ 1
Issuance of treasury stock under stock plans (in shares)							(50,092)
Stock awards (in shares)		373,503
Stock awards		$ 0
Net earnings (loss) attributable to Celanese Corporation	$ 311			311
Common stock dividends				(152)
Other comprehensive income (loss), net of tax	(184)				(184)
Balance as of the beginning of the period, noncontrolling interest at Dec. 31, 2022	468					468
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	3					3
Distributions/dividends to noncontrolling interests						(7)
Balance as of the end of the period, noncontrolling interest at Jun. 30, 2023	464					464
Balance as of the end of the period (in shares) at Jun. 30, 2023		108,847,435					61,611,401
Balance as of the end of the period at Jun. 30, 2023	6,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Celanese Corporation stockholders' equity		$ 0	365	11,289	(502)		$ (5,491)
Balance as of the beginning of the period (in shares) at Mar. 31, 2023		108,786,738					61,661,493
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of tax			18
Issuance of treasury stock under stock plans							$ 1
Issuance of treasury stock under stock plans (in shares)							(50,092)
Stock awards (in shares)		60,697
Stock awards		$ 0
Net earnings (loss) attributable to Celanese Corporation	220			220
Common stock dividends				(76)
Other comprehensive income (loss), net of tax	(200)				(200)
Balance as of the beginning of the period, noncontrolling interest at Mar. 31, 2023						469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	1					1
Distributions/dividends to noncontrolling interests						(6)
Balance as of the end of the period, noncontrolling interest at Jun. 30, 2023	464					$ 464
Balance as of the end of the period (in shares) at Jun. 30, 2023		108,847,435					61,611,401
Balance as of the end of the period at Jun. 30, 2023	6,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Celanese Corporation stockholders' equity	$ 5,624	$ 0	$ 383	$ 11,433	$ (702)		$ (5,490)