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Pension and Other Postretirement Benefits - Schedule of Fair Value of Plan Assets (Parenthetical) (Detail) (Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Equity assets amount reclassified from domestic equity to international equity $ 43pom_DefinedBenefitPlanEquityAssetsReclassifiedFromDomesticEquityToInternationalEquity
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member