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Commitments and Contingencies Commitments and Contingencies - Legal Matters (Details) (USA Power [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Loss Contingencies [Line Items]  
Loss Contingency, Original Damages Sought, Legal Fees as a Percentage of Damages 40.00%pcorp_LossContingencyOriginalDamagesSoughtLegalFeesAsPercentageOfDamages
Loss Contingency, Damages Awarded, Value $ 113us-gaap_LossContingencyDamagesAwardedValue
Loss Contingency, Damages and Attorney Fees Awarded, Value 115pcorp_LossContingencyDamagesandAttorneyFeesAwardedValue
Loss Contingency Accrual 119us-gaap_LossContingencyAccrualAtCarryingValue
Amount Awarded for Actual Damages [Member]
 
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded by Jury, Value 18pcorp_LossContingencyDamagesAwardedByJuryValue
/ pcorp_LitigationCaseNameAxis
= pcorp_UsaPowerMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= pcorp_AmountAwardedForActualDamagesMember
Amount Awarded for Unjust Enrichment [Member]
 
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded by Jury, Value $ 113pcorp_LossContingencyDamagesAwardedByJuryValue
/ pcorp_LitigationCaseNameAxis
= pcorp_UsaPowerMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= pcorp_AmountAwardedForUnjustEnrichmentMember