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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Minimum	Sep. 30, 2012 Maximum
Environmental
Estimated environmental reserve	$ 106	$ 74
Reserve for environmental liabilities, short-term	28	12
Reserve for environmental liabilities, long-term	78	62
Probable recoveries from insurers and third parties recorded as a receivable	$ 50	$ 47
Actual cash expenditures for environmental liabilities, period paid			3 years	5 years

X

- Definition

The range of the estimated period of time when actual cash expenditures are made for environmental liabilities, as stated in years.

+ References

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

+ References

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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- Definition

Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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