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Retirement Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Capitalization of pension and OPEB expense related to engineering and plant construction $ 5ftr_CapitalizationOfPensionAndOpebExpenseRelatedToEngineeringAndPlantConstruction $ 4ftr_CapitalizationOfPensionAndOpebExpenseRelatedToEngineeringAndPlantConstruction  
Pension/OPEB costs 2us-gaap_PensionAndOtherPostretirementBenefitExpense 3us-gaap_PensionAndOtherPostretirementBenefitExpense 74us-gaap_PensionAndOtherPostretirementBenefitExpense
Additional contributions to pension plan 23us-gaap_DefinedBenefitPlanContributionsByEmployer    
Plan assets 1,718us-gaap_DefinedBenefitPlanFairValueOfPlanAssets   1,673us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease) 45us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease    
Percentage of increase in pension plan 3.00%ftr_PercentageOfIncreaseInPensionPlan    
Defined benefit plan, cash contributions by employer 17us-gaap_PensionContributions    
Benefit payments 27us-gaap_DefinedBenefitPlanBenefitsPaid    
Positive investment returns 55ftr_PositiveInvestmentReturns    
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 100us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear    
Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Estimated Pension And OPEB Expense 85ftr_EstimatedPensionAndOpebExpense
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Maximum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Estimated Pension And OPEB Expense $ 105ftr_EstimatedPensionAndOpebExpense
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