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Debt (Schedule of Balances Available for Borrowings)(Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 24, 2014
Debt Instrument [Line Items]      
Borrowings outstanding $ 30us-gaap_LinesOfCreditCurrent [1] $ 35us-gaap_LinesOfCreditCurrent [1]  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Borrowings outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
   
Letters of credit issued 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
   
Available for borrowing 900us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
   
Maximum borrowing base     900us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Accounts Receivable Securitization Facility [Member]      
Debt Instrument [Line Items]      
Repayments of Lines of Credit 5us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
   
Borrowings outstanding 30us-gaap_LinesOfCreditCurrent
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
[2]    
Letters of credit issued 74us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
   
Available for borrowing 12us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
   
Total borrowing base 116us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
   
Maximum borrowing base 135us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
[3]    
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers $ 154us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ us-gaap_DebtInstrumentAxis
= ce_AccountsReceivableSecuritizationFacilityMember
   
[1] The weighted average interest rate was 0.7% as of March 31, 2015 and December 31, 2014.
[2] The Company repaid $5 million of borrowings outstanding during the three months ended March 31, 2015.
[3] Outstanding accounts receivable transferred by the Originators to the Transferor was $154 million.