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Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OPERATING ACTIVITIES:      
Net income $ 170,553us-gaap_NetIncomeLoss $ 172,987us-gaap_NetIncomeLoss $ 136,723us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 99,138us-gaap_Depreciation 96,109us-gaap_Depreciation 93,419us-gaap_Depreciation
Regulatory debits (credits) 1,487nwp_RegulatoryDebitsCredits 921nwp_RegulatoryDebitsCredits (494)nwp_RegulatoryDebitsCredits
Gain on sale of property, plant and equipment (70)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Amortization of deferred charges and credits 894nwp_AmortizationOfDeferredChargesAndCredits 1,720nwp_AmortizationOfDeferredChargesAndCredits 1,578nwp_AmortizationOfDeferredChargesAndCredits
Allowance for equity funds used during construction (391)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (945)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (1,564)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Changes in current assets and liabilities:      
Trade and other accounts receivable 395us-gaap_IncreaseDecreaseInAccountsReceivable 2,133us-gaap_IncreaseDecreaseInAccountsReceivable (8,291)us-gaap_IncreaseDecreaseInAccountsReceivable
Affiliated receivables 38,388us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties (38,744)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties 567us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties
Exchange gas due from others (1,433)nwp_IncreaseDecreaseInExchangeGasDueFromOthers 153nwp_IncreaseDecreaseInExchangeGasDueFromOthers (1,262)nwp_IncreaseDecreaseInExchangeGasDueFromOthers
Materials and supplies 203us-gaap_IncreaseDecreaseInInventories (132)us-gaap_IncreaseDecreaseInInventories 351us-gaap_IncreaseDecreaseInInventories
Other current assets (1,326)us-gaap_IncreaseDecreaseInOtherOperatingAssets (202)us-gaap_IncreaseDecreaseInOtherOperatingAssets 116us-gaap_IncreaseDecreaseInOtherOperatingAssets
Trade accounts payable (4,958)us-gaap_IncreaseDecreaseInAccountsPayableTrade (212)us-gaap_IncreaseDecreaseInAccountsPayableTrade 6,305us-gaap_IncreaseDecreaseInAccountsPayableTrade
Affiliated payables 2,007us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties 224us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties 2,100us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties
Exchange gas due to others 2,179nwp_IncreaseDecreaseInExchangeGasDueToOthers (153)nwp_IncreaseDecreaseInExchangeGasDueToOthers 1,262nwp_IncreaseDecreaseInExchangeGasDueToOthers
Other accrued liabilities (3,095)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 3,885us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 169us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Changes in noncurrent assets and liabilities:      
Deferred charges (2,087)us-gaap_IncreaseDecreaseInDeferredCharges (7,448)us-gaap_IncreaseDecreaseInDeferredCharges (4,015)us-gaap_IncreaseDecreaseInDeferredCharges
Noncurrent liabilities 11,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 9,819us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 5,442us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 312,884us-gaap_NetCashProvidedByUsedInOperatingActivities 240,115us-gaap_NetCashProvidedByUsedInOperatingActivities 232,406us-gaap_NetCashProvidedByUsedInOperatingActivities
FINANCING ACTIVITIES:      
Capital contributions from parent 0us-gaap_ProceedsFromContributionsFromParent 13,300us-gaap_ProceedsFromContributionsFromParent 8,630us-gaap_ProceedsFromContributionsFromParent
Cash distributions to parent (234,000)us-gaap_PaymentsOfDistributionsToAffiliates (91,000)us-gaap_PaymentsOfDistributionsToAffiliates (137,500)us-gaap_PaymentsOfDistributionsToAffiliates
Other (622)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (1,318)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 329us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities (234,622)us-gaap_NetCashProvidedByUsedInFinancingActivities (79,018)us-gaap_NetCashProvidedByUsedInFinancingActivities (128,541)us-gaap_NetCashProvidedByUsedInFinancingActivities
Property, plant and equipment:      
Capital expenditures, net of equity AFUDC (79,413)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (83,317)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (136,168)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Contributions and Advances for Construction Costs 3,056nwp_ContributionsandAdvancesforConstructionCosts 6,326nwp_ContributionsandAdvancesforConstructionCosts 1,838nwp_ContributionsandAdvancesforConstructionCosts
Proceeds from sales 5,728us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 5,756us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 7,843us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Repayments from (advances to) affiliates, net (15,886)us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent (89,846)us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent 22,702us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent
Proceeds from insurance 8,274us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Net cash used in investing activities (78,241)us-gaap_NetCashProvidedByUsedInInvestingActivities (161,081)us-gaap_NetCashProvidedByUsedInInvestingActivities (103,785)us-gaap_NetCashProvidedByUsedInInvestingActivities
NET INCREASE IN CASH 21us-gaap_CashPeriodIncreaseDecrease 16us-gaap_CashPeriodIncreaseDecrease 80us-gaap_CashPeriodIncreaseDecrease
CASH AT BEGINNING OF PERIOD 133us-gaap_Cash 117us-gaap_Cash 37us-gaap_Cash
CASH AT END OF PERIOD 154us-gaap_Cash 133us-gaap_Cash 117us-gaap_Cash
Supplemental Cash Flow Elements [Abstract]      
Increases to property, plant and equipment (71,207)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment (88,123)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment (133,998)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
Changes in related accounts payable and accrued liabilities (8,206)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 4,806us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (2,170)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Capital expenditures, net of equity AFUDC $ (79,413)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment $ (83,317)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment $ (136,168)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment