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Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Taxes [Abstract]    
Consolidated tax provision at federal statutory rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax provisions, net of federal income tax benefit (in hundredths) 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Changes in certain deferred tax balances (in hundredths)   (5.10%)ftr_EffectiveIncomeTaxRateReconciliationChangeInCertainDeferredTaxBalances
All other, net (in hundredths) (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (in hundredths) 37.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations