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

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- 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 -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition The Increase or Decrease in the accrual for environmental loss contingencies during the reporting period related to currency translations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Foreign Currency Translation -URI http://asc.fasb.org/extlink&oid=6513664 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition The aggregate amount disbursed during the reporting period to settle environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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