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Employee Retirement Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
United States pension plan  
Defined Benefit Plan Disclosure [Line Items]  
Contribution by employer $ 2us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Canada pension plan  
Defined Benefit Plan Disclosure [Line Items]  
Contribution by employer 1us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Estimated total contributions in current year $ 66us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember