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Schedule I - Condensed Financial Information of Parent (Balance Sheet Parenthetical) (Details) (Parent Company, USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Deferred financing costs, accumulated amortization | $ 81 us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 71 us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Carrying amount of accumulated amortization of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration