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Long-term Debt and Capital Lease Obligations Annual Maturities of Long-term Debt and Capital Lease Obligations (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Unamortized discount $ (13)us-gaap_DebtInstrumentUnamortizedDiscount  
Carrying Value 7,019us-gaap_LongTermDebt 6,828us-gaap_LongTermDebt
Amounts representing interest (28)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments in Next Twelve Months 137us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Two Years 62us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Three Years 62us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Four Years 592us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Five Years 355us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive  
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due Thereafter 5,886us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments 7,094pcorp_TotalLongTermDebtMaturitiesAndCapitalLeasesFutureMinimumPayments  
Total long-term debt and capital lease obligations 7,053us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities 6,877us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 132us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Two 57us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Three 52us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Four 586us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Five 350us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Long-term Debt, Maturities, Repayments of Principal after Year Five 5,855us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Principal Amount 7,032us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Unamortized discount (13)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Carrying Value 7,019us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital Leases, Future Minimum Payments Due, Next Twelve Months 5us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due in Two Years 5us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due in Three Years 10us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due in Four Years 6us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due in Five Years 5us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due Thereafter 31us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Leases, Future Minimum Payments Due 62us-gaap_CapitalLeasesFutureMinimumPaymentsDue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Amounts representing interest (28)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital Lease Obligations $ 34us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember