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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Asset Allocation Ranges) (Details)
 12 Months Ended
Dec. 31, 2014
Maximum [Member]  
Domestic and International Equities 48.00%pch_DefinedBenefitPlanLongTermAssetAllocationRangeDomesticandInternationalEquities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Fixed income securities 58.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeFixedIncomeAndConvertibleSecurities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Alternatives 18.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeAlternatives
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Cash 5.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeCash
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member]  
Domestic and International Equities 24.00%pch_DefinedBenefitPlanLongTermAssetAllocationRangeDomesticandInternationalEquities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Fixed income securities 38.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeFixedIncomeAndConvertibleSecurities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Alternatives 12.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeAlternatives
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Cash 0.00%pch_DefinedBenefitPlansLongTermAssetAllocationRangeCash
/ us-gaap_RangeAxis
= us-gaap_MinimumMember