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Schedule of Change in Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract] |  |  |  |  |
Asset Retirement Obligation |  |  | $ 100 us-gaap_AssetRetirementObligation | $ 94 us-gaap_AssetRetirementObligation | $ 87 us-gaap_AssetRetirementObligation
Asset Retirement Obligation, Liabilities Incurred | 7 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 8 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 15 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 4 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred
Asset Retirement Obligation, Liabilities Settled |  |  | (3)us-gaap_AssetRetirementObligationLiabilitiesSettled | (4)us-gaap_AssetRetirementObligationLiabilitiesSettled | (3)us-gaap_AssetRetirementObligationLiabilitiesSettled
Asset Retirement Obligation, Accretion Expense |  |  | 6 us-gaap_AssetRetirementObligationAccretionExpense | 6 us-gaap_AssetRetirementObligationAccretionExpense | 6 us-gaap_AssetRetirementObligationAccretionExpense
Asset Retirement Obligation, Revision of Estimate |  |  | 2 us-gaap_AssetRetirementObligationRevisionOfEstimate | 0 us-gaap_AssetRetirementObligationRevisionOfEstimate | 4 us-gaap_AssetRetirementObligationRevisionOfEstimate
Asset Retirement Obligation | $ 116 us-gaap_AssetRetirementObligation | $ 116 us-gaap_AssetRetirementObligation | $ 116 us-gaap_AssetRetirementObligation | $ 100 us-gaap_AssetRetirementObligation | $ 94 us-gaap_AssetRetirementObligation

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration