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Acquisitions and Dispositions (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Dispositions |  |  |
Proceeds from sale of various property and equipment | $ 28 us-gaap_ProceedsFromSaleOfProductiveAssets | $ 200 us-gaap_ProceedsFromSaleOfProductiveAssets | $ 22 us-gaap_ProceedsFromSaleOfProductiveAssets
Gain (loss) on sale of various property and equipment | 1 us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  | 6 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Maximum |  |  |
Dispositions |  |  |
Gain (loss) on sale of various property and equipment |  | $ 1 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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