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Benefit Plans (Details 6)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Health care cost trend rate assumed for the next year:    
Pre-age 65 (as a percent) 6.70%af_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearForPre65YearsOfAge 7.00%af_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearForPre65YearsOfAge
Post-age 65 (as a percent) 9.00%af_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearForPost65YearsOfAge 10.00%af_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearForPost65YearsOfAge
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Year that the rate reaches the ultimate trend rate 2021 2021