Debt Instrument Tender Purchase Price Per 1000 Principal Amount

No definition available.

Name:	ce_DebtInstrumentTenderPurchasePricePer1000PrincipalAmount
Namespace Prefix:	ce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of discount to face value for bond issuance.

+ References

No definition available.

+ Details

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

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredNotesDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredNotesDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredNotesDue2025Member
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredNotesDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ce_SeniorUnsecuredRevolvingCreditFacilityMember
Namespace Prefix:
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Debt Debt (Senior Notes Narrative) (Details) $ in Millions			12 Months Ended
Debt Debt (Senior Notes Narrative) (Details) $ in Millions	Sep. 13, 2021 USD ($)	Aug. 05, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 13, 2021 EUR (€)	Sep. 10, 2021 EUR (€)
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Repayments of Long-term Debt			$ 786	$ 30	$ 360
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Interest Rate			3.50%
Senior Unsecured Notes Due 2023 [Member]
Debt Instrument [Line Items]
Interest Rate			1.125%
Debt Instrument, Repurchased Face Amount \| €						€ 300,000,000
Debt Instrument Tender Purchase Price Per 1000 Principal Amount \| €						€ 1,027.35
Debt Instrument, Repurchase Amount	$ 363
Interest Expense, Debt	4
Repayments of Long-term Debt	$ 353
Write off of Deferred Debt Issuance Cost			$ 9
Senior Unsecured Notes Due 2025 [Member]
Debt Instrument [Line Items]
Interest Rate			1.25%
Senior Unsecured Notes Due 2027 [Member]
Debt Instrument [Line Items]
Interest Rate			2.125%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 400
Interest Rate			1.40%
Percentage of Face		99.899%
Senior Unsecured Notes Due 2028
Debt Instrument [Line Items]
Long-term Debt, Gross \| €							€ 500,000,000
Interest Rate			0.625%
Percentage of Face							99.898%
Revolving Credit Facility [Member] \| Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Lines of Credit		$ 396	$ 650