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Accrued Expenses and Other Long-Term Liabilities, Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Environmental Liabilities Rollforward Analysis
Balance as of beginning of year	$ 301us-gaap_AccrualForEnvironmentalLossContingencies	$ 269us-gaap_AccrualForEnvironmentalLossContingencies	$ 274us-gaap_AccrualForEnvironmentalLossContingencies
Additions to liability	26us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses	67us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses	23us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses
Reductions to liability	0us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	(1)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	(1)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates
Payments, net of third-party recoveries	(27)us-gaap_AccrualForEnvironmentalLossContingenciesPayments	(28)us-gaap_AccrualForEnvironmentalLossContingenciesPayments	(29)us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Separation of retail business	0us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForAcquisitionsAndDivestitures	(4)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForAcquisitionsAndDivestitures	0us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForAcquisitionsAndDivestitures
Foreign currency translation	(5)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForCurrencyTranslation	(2)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForCurrencyTranslation	2us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForCurrencyTranslation
Balance as of end of year	$ 295us-gaap_AccrualForEnvironmentalLossContingencies	$ 301us-gaap_AccrualForEnvironmentalLossContingencies	$ 269us-gaap_AccrualForEnvironmentalLossContingencies

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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- Definition

The Increase or Decrease in the accrual for environmental loss contingencies in the period arising from business acquisitions or divestitures.

+ References

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The Increase or Decrease in the accrual for environmental loss contingencies during the reporting period related to currency translations.

+ References

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The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements.

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The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

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The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates.

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