Debt (Tables)

12 Months Ended

Dec. 31, 2017

Line of Credit Facility [Line Items]

Schedule of Short-term Debt

	As of December 31,
	2017	2016
	(In $ millions)
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Current installments of long-term debt	63	27
Short-term borrowings, including amounts due to affiliates(1)	86	68
Short-term SOFTER bank loans (Note 4)(2)	—	23
Revolving credit facility(3)	97	—
Accounts receivable securitization facility(4)	80	—
Total	326	118

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⁽¹⁾  The weighted average interest rate was 2.8% and 3.1% as of December 31, 2017 and 2016, respectively.

⁽²⁾  The weighted average interest rate was 1.2% as of December 31, 2016.

⁽³⁾  The weighted average interest rate was 4.1% as of December 31, 2017.

⁽⁴⁾  The weighted average interest rate was 2.1% as of December 31, 2017.

Schedule of Long-term Debt

	As of December 31,
	2017		2016
	(In $ millions)
Long-Term Debt
Senior unsecured term loan due 2021(1)	494		500
Senior unsecured notes due 2019, interest rate of 3.250%	360		316
Senior unsecured notes due 2021, interest rate of 5.875%	400		400
Senior unsecured notes due 2022, interest rate of 4.625%	500		500
Senior unsecured notes due 2023, interest rate of 1.125%	897		788
Senior unsecured notes due 2025, interest rate of 1.250%	359		—
Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 4.05% to 5.00%	169		170
SOFTER bank loans due at various dates through 2021(Note 4)(2)	—		47
Nilit bank loans due at various dates through 2026 (Note 4)(3)	11		—
Obligations under capital leases due at various dates through 2054	208		217
Subtotal	3,398		2,938
Unamortized debt issuance costs(4)	(20	)	(21	)
Current installments of long-term debt	(63	)	(27	)
Total	3,315		2,890

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⁽¹⁾  The margin for borrowings under the senior unsecured term loan due 2021 was 1.5% above LIBOR at current Celanese credit ratings.

⁽²⁾  The weighted average interest rate was 1.6% as of December 31, 2016.

⁽³⁾  The weighted average interest rate was 1.3% as of December 31, 2017.

⁽⁴⁾  Related to the Company's long-term debt, excluding obligations under capital leases.

Schedule of Net Deferred Financing Costs

Net deferred financing costs are as follows:

	(In $ millions)
As of December 31, 2014	27
Financing costs deferred	—
Accelerated amortization due to refinancing activity	—
Amortization	(5	)
As of December 31, 2015(1)	22
Financing costs deferred(2)	13
Accelerated amortization due to refinancing activity(3)	(3	)
Amortization	(5	)
As of December 31, 2016(1)	27
Financing costs deferred(4)	1
Accelerated amortization due to refinancing activity	—
Amortization	(4	)
As of December 31, 2017(1)	24

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⁽¹⁾  Includes $4 million, $6 million and $4 million as of December 31,2017, 2016 and 2015, respectively, related to the Company's revolving credit facility and accounts receivables securitization facility, which are included in noncurrent Other assets in the consolidated balance sheets.

⁽²⁾  Includes $5 million, $6 million and $2 million related to the Credit Agreement, the 1.125% Notes and the pollution control and industrial revenue bonds, respectively, all of which are being amortized through the term of the respective financing arrangement.

⁽³⁾  Includes $2 million and $1 million related to the senior secured credit facilities and the pollution control and industrial revenue bonds, respectively, which are included in Refinancing expense in the consolidated statement of operations during the year ended December 31, 2016.

Schedule of Principle Payments

Principal payments scheduled to be made on the Company's debt, including short-term borrowings, are as follows:

	(In $ millions)
2018	326
2019	437
2020	80
2021	794
2022	526
Thereafter	1,498
Total	3,661

Accounts Receivable Securitization Facility [Member]

Line of Credit Facility [Line Items]

Schedule of Balances Available for Borrowing

The Company's debt balances and amounts available for borrowing under its securitization facility are as follows:

	As of December 31, 2017
	(In $ millions)
Accounts Receivable Securitization Facility
Borrowings outstanding(1)	80
Letters of credit issued	29
Available for borrowing	11
Total borrowing base	120
Maximum borrowing base(2)	120

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⁽¹⁾  The Company borrowed $85 million and repaid $5 million during the year ended December 31, 2017.

⁽²⁾  Outstanding accounts receivable transferred to the SPE was $158 million.

Senior Unsecured Revolving Credit Facility [Member]

Line of Credit Facility [Line Items]

Schedule of Balances Available for Borrowing

The Company's debt balances and amounts available for borrowing under its senior unsecured revolving credit facility are as follows:

	As of December 31, 2017
	(In $ millions)
Revolving Credit Facility
Borrowings outstanding(1)	97
Letters of credit issued	—
Available for borrowing(2)	903

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⁽¹⁾  The Company borrowed $528 million and repaid $431 million under its senior unsecured revolving credit facility during the year ended December 31, 2017.

⁽²⁾  The margin for borrowings under the senior unsecured revolving credit facility were 1.5% above LIBOR at current Company credit ratings.