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Commitments and Contingencies (Purchase Obligations Narrative2) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Recorded Unconditional Purchase Obligation [Line Items]
Accelerated amortization	$ 22
Resolution of commercial disputes		2	15	13
Acetyl Intermediates [Member]
Recorded Unconditional Purchase Obligation [Line Items]
Accelerated amortization				20
Resolution of commercial disputes			17
Advanced Engineered Materials [Member]
Recorded Unconditional Purchase Obligation [Line Items]
Accelerated amortization				$ 2

The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

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