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Commitments and Contingencies - Letters of Credit Narrative (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments and Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding | $ 95 us-gaap_LettersOfCreditOutstandingAmount | $ 71 us-gaap_LettersOfCreditOutstandingAmount

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant