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

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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

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