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Fair Value Measurements Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure $ 45us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 38us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 9us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 2us-gaap_AssetsFairValueDisclosure
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Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market mutual funds 22us-gaap_AvailableForSaleSecurities
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Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market mutual funds 22us-gaap_AvailableForSaleSecurities
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Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market mutual funds 0us-gaap_AvailableForSaleSecurities
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Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market mutual funds 0us-gaap_AvailableForSaleSecurities
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Investment funds [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 16us-gaap_TradingSecurities
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Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 16us-gaap_TradingSecurities
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Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0us-gaap_TradingSecurities
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Investment funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0us-gaap_TradingSecurities
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Commodity Contract [Member]    
Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash collateral, net receivable, offset against derivative positions 64pcorp_CashCollateralNetReceivablePayableOffsetAgainstDerivativePositions
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Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 0us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
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Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 9us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
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Fair Value, Assets (Liabilities) Measured on Recurring and Nonrecurring Basis [Line Items]    
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[1] Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. Money market mutual funds are accounted for as available-for-sale securities and the fair value approximates cost.
[2] Represents netting under master netting arrangements and a net cash collateral receivable of $64 million and $28 million as of March 31, 2015 and December 31, 2014, respectively.