Debt - Factoring and Discounting Agreements Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Europe Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage	100.00%
Singapore Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage	90.00%
Europe and Singapore Factoring Agreement
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, amount derecognized	$ 87	$ 320
Proceeds collected on accounts receivable sold under factoring facilities	$ 82	$ 325

Proceeds Collected on Accounts Receivable Sold under Factoring Facilities

No definition available.

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Namespace Prefix:	ce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Transfer Of Financial Assets Accounted For As Sales, Non-recourse Basis, Account Receivable Percentage

+ References

No definition available.

+ Details

Name:	ce_TransferOfFinancialAssetsAccountedForAsSalesNonRecourseBasisAccountReceivablePercentage
Namespace Prefix:	ce_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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