2.4.1.9 Html 302 326 1 true 115 0 false 11 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://nvenergy.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://nvenergy.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://nvenergy.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://nvenergy.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations false false R5.htm 1003000 - Statement - Consolidated Statements of Changes in Shareholder's Equity Sheet http://nvenergy.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity Consolidated Statements of Changes in Shareholder's Equity false false R6.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://nvenergy.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R7.htm 2101100 - Disclosure - Organization and Operations (Notes) Notes http://nvenergy.com/role/OrganizationAndOperationsNotes Organization and Operations (Notes) false false R8.htm 2101100 - Disclosure - Summary of Significant Accounting Policies (Notes) Notes http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesNotes Summary of Significant Accounting Policies (Notes) false false R9.htm 2102100 - Disclosure - Merger-Related Activities (Notes) Notes http://nvenergy.com/role/MergerRelatedActivitiesNotes Merger-Related Activities (Notes) false false R10.htm 2104100 - Disclosure - Property, Plant and Equipment, Net (Notes) Notes http://nvenergy.com/role/PropertyPlantAndEquipmentNetNotes Property, Plant and Equipment, Net (Notes) false false R11.htm 2108100 - Disclosure - Jointly Owned Utility Facilities (Notes) Notes http://nvenergy.com/role/JointlyOwnedUtilityFacilitiesNotes Jointly Owned Utility Facilities (Notes) false false R12.htm 2109100 - Disclosure - Regulatory Matters (Notes) Notes http://nvenergy.com/role/RegulatoryMattersNotes Regulatory Matters (Notes) false false R13.htm 2110100 - Disclosure - Credit Facility (Notes) Notes http://nvenergy.com/role/CreditFacilityNotes Credit Facility (Notes) false false R14.htm 2111100 - Disclosure - Long-Term Debt (Notes) Notes http://nvenergy.com/role/LongTermDebtNotes Long-Term Debt (Notes) false false R15.htm 2113100 - Disclosure - Risk Management (Notes) Notes http://nvenergy.com/role/RiskManagementNotes Risk Management (Notes) false false R16.htm 2114100 - Disclosure - Fair Value Measurements (Notes) Notes http://nvenergy.com/role/FairValueMeasurementsNotes Fair Value Measurements (Notes) false false R17.htm 2116100 - Disclosure - Other, Net (Notes) Notes http://nvenergy.com/role/OtherNetNotes Other, Net (Notes) false false R18.htm 2117100 - Disclosure - Income Taxes (Notes) Notes http://nvenergy.com/role/IncomeTaxesNotes Income Taxes (Notes) false false R19.htm 2118100 - Disclosure - Related-Party Transactions (Notes) Notes http://nvenergy.com/role/RelatedPartyTransactionsNotes Related-Party Transactions (Notes) false false R20.htm 2119100 - Disclosure - Retirement Plan and Postretirement Benefits (Notes) Notes http://nvenergy.com/role/RetirementPlanAndPostretirementBenefitsNotes Retirement Plan and Postretirement Benefits (Notes) false false R21.htm 2120100 - Disclosure - Asset Retirement Obligations (Notes) Notes http://nvenergy.com/role/AssetRetirementObligationsNotes Asset Retirement Obligations (Notes) false false R22.htm 2121100 - Disclosure - Commitments and Contingencies (Notes) Notes http://nvenergy.com/role/CommitmentsAndContingenciesNotes Commitments and Contingencies (Notes) false false R23.htm 2124100 - Disclosure - Supplemental Cash Flow Disclosures (Notes) Notes http://nvenergy.com/role/SupplementalCashFlowDisclosuresNotes Supplemental Cash Flow Disclosures (Notes) false false R24.htm 2125100 - Disclosure - Unaudited Quarterly Operating Results (Notes) Notes http://nvenergy.com/role/UnauditedQuarterlyOperatingResultsNotes Unaudited Quarterly Operating Results (Notes) false false R25.htm 2201201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) false false R26.htm 2304301 - Disclosure - Property, Plant and Equipment, Net (Tables) Sheet http://nvenergy.com/role/PropertyPlantAndEquipmentNetTables Property, Plant and Equipment, Net (Tables) false false R27.htm 2308301 - Disclosure - Jointly Owned Utility Facilities (Tables) Sheet http://nvenergy.com/role/JointlyOwnedUtilityFacilitiesTables Jointly Owned Utility Facilities (Tables) false false R28.htm 2309301 - Disclosure - Regulatory Matters (Tables) Sheet http://nvenergy.com/role/RegulatoryMattersTables Regulatory Matters (Tables) false false R29.htm 2311301 - Disclosure - Long-Term Debt (Tables) Sheet http://nvenergy.com/role/LongTermDebtTables Long-Term Debt (Tables) false false R30.htm 2313301 - Disclosure - Risk Management Risk Management (Tables) Sheet http://nvenergy.com/role/RiskManagementRiskManagementTables Risk Management Risk Management (Tables) false false R31.htm 2314301 - Disclosure - Fair Value Measurements (Tables) Sheet http://nvenergy.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) false false R32.htm 2316301 - Disclosure - Other, Net (Tables) Sheet http://nvenergy.com/role/OtherNetTables Other, Net (Tables) false false R33.htm 2317301 - Disclosure - Income Taxes (Tables) Sheet http://nvenergy.com/role/IncomeTaxesTables Income Taxes (Tables) false false R34.htm 2319301 - Disclosure - Retirement Plan and Postretirement Benefits (Tables) Sheet http://nvenergy.com/role/RetirementPlanAndPostretirementBenefitsTables Retirement Plan and Postretirement Benefits (Tables) false false R35.htm 2320301 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://nvenergy.com/role/AssetRetirementObligationsTables Asset Retirement Obligations (Tables) false false R36.htm 2321301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://nvenergy.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R37.htm 2324301 - Disclosure - Supplemental Cash Flow Disclosures (Tables) Sheet http://nvenergy.com/role/SupplementalCashFlowDisclosuresTables Supplemental Cash Flow Disclosures (Tables) false false R38.htm 2325301 - Disclosure - Unaudited Quarterly Operating Results (Tables) Sheet http://nvenergy.com/role/UnauditedQuarterlyOperatingResultsTables Unaudited Quarterly Operating Results (Tables) false false R39.htm 2401401 - Disclosure - Organization and Operations (Details) Sheet http://nvenergy.com/role/OrganizationAndOperationsDetails Organization and Operations (Details) false false R40.htm 2401402 - Disclosure - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesAllowanceForDoubtfulAccountsDetails Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) false false R41.htm 2401403 - Disclosure - Summary of Significant Accounting Policies - Inventory (Details) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesInventoryDetails Summary of Significant Accounting Policies - Inventory (Details) false false R42.htm 2401404 - Disclosure - Summary of Significant Accounting Policies - Property, Plant and Equipment, Net (Details) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentNetDetails Summary of Significant Accounting Policies - Property, Plant and Equipment, Net (Details) false false R43.htm 2401405 - Disclosure - Summary of Significant Accounting Policies - Income Taxes (Details) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesIncomeTaxesDetails Summary of Significant Accounting Policies - Income Taxes (Details) false false R44.htm 2401406 - Disclosure - Summary of Significant Accounting Policies - Revenue Recognition (Details) Sheet http://nvenergy.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails Summary of Significant Accounting Policies - Revenue Recognition (Details) false false R45.htm 2402401 - Disclosure - Merger-Related Activities (Details) Sheet http://nvenergy.com/role/MergerRelatedActivitiesDetails Merger-Related Activities (Details) false false R46.htm 2404402 - Disclosure - Property, Plant and Equipment, Net (Details) Sheet http://nvenergy.com/role/PropertyPlantAndEquipmentNetDetails Property, Plant and Equipment, Net (Details) false false R47.htm 2408402 - Disclosure - Jointly Owned Utility Facilities (Details) Sheet http://nvenergy.com/role/JointlyOwnedUtilityFacilitiesDetails Jointly Owned Utility Facilities (Details) false false R48.htm 2409402 - Disclosure - Regulatory Matters - Regulatory Assets (Details) Sheet http://nvenergy.com/role/RegulatoryMattersRegulatoryAssetsDetails Regulatory Matters - Regulatory Assets (Details) false false R49.htm 2409403 - Disclosure - Regulatory Matters - Regulatory Liabilities (Details) Sheet http://nvenergy.com/role/RegulatoryMattersRegulatoryLiabilitiesDetails Regulatory Matters - Regulatory Liabilities (Details) false false R50.htm 2409404 - Disclosure - Regulatory Matters - General Disclosures (Details) Sheet http://nvenergy.com/role/RegulatoryMattersGeneralDisclosuresDetails Regulatory Matters - General Disclosures (Details) false false R51.htm 2410401 - Disclosure - Credit Facility (Details) Sheet http://nvenergy.com/role/CreditFacilityDetails Credit Facility (Details) false false R52.htm 2411402 - Disclosure - Long-Term Debt - Summary (Details) Sheet http://nvenergy.com/role/LongTermDebtSummaryDetails Long-Term Debt - Summary (Details) false false R53.htm 2411403 - Disclosure - Long-Term Debt - Narrative (Details) Sheet http://nvenergy.com/role/LongTermDebtNarrativeDetails Long-Term Debt - Narrative (Details) false false R54.htm 2411404 - Disclosure - Long-Term Debt - Maturity Schedule (Details) Sheet http://nvenergy.com/role/LongTermDebtMaturityScheduleDetails Long-Term Debt - Maturity Schedule (Details) false false R55.htm 2411405 - Disclosure - Long-Term Debt - Capital Leases - Narrative (Details) Sheet http://nvenergy.com/role/LongTermDebtCapitalLeasesNarrativeDetails Long-Term Debt - Capital Leases - Narrative (Details) false false R56.htm 2413402 - Disclosure - Risk Management (Details) Sheet http://nvenergy.com/role/RiskManagementDetails Risk Management (Details) false false R57.htm 2414402 - Disclosure - Fair Value Measurements (Details) Sheet http://nvenergy.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) false false R58.htm 2414403 - Disclosure - Fair Value Measurements - Debt (Details) Sheet http://nvenergy.com/role/FairValueMeasurementsDebtDetails Fair Value Measurements - Debt (Details) false false R59.htm 2416402 - Disclosure - Other, Net (Details) Sheet http://nvenergy.com/role/OtherNetDetails Other, Net (Details) false false R60.htm 2417402 - Disclosure - Income Taxes Components of Income Tax Expense (Benefit) (Details) Sheet http://nvenergy.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseBenefitDetails Income Taxes Components of Income Tax Expense (Benefit) (Details) false false R61.htm 2417403 - Disclosure - Income Taxes Reconciliation of Effective Income Tax Rate (Details) Sheet http://nvenergy.com/role/IncomeTaxesReconciliationOfEffectiveIncomeTaxRateDetails Income Taxes Reconciliation of Effective Income Tax Rate (Details) false false R62.htm 2417404 - Disclosure - Income Taxes Components of Net Deferred Income Tax Liability (Details) Sheet http://nvenergy.com/role/IncomeTaxesComponentsOfNetDeferredIncomeTaxLiabilityDetails Income Taxes Components of Net Deferred Income Tax Liability (Details) false false R63.htm 2417405 - Disclosure - Income Taxes Summary of Operating Loss Carryforwards (Details) Sheet http://nvenergy.com/role/IncomeTaxesSummaryOfOperatingLossCarryforwardsDetails Income Taxes Summary of Operating Loss Carryforwards (Details) false false R64.htm 2417406 - Disclosure - Income Taxes Net Unrecognized Tax Benefits (Details) Sheet http://nvenergy.com/role/IncomeTaxesNetUnrecognizedTaxBenefitsDetails Income Taxes Net Unrecognized Tax Benefits (Details) false false R65.htm 2418401 - Disclosure - Related Party Transactions (Details) Sheet http://nvenergy.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) false false R66.htm 2419402 - Disclosure - Retirement Plan and Postretirement Benefits (Details) Sheet http://nvenergy.com/role/RetirementPlanAndPostretirementBenefitsDetails Retirement Plan and Postretirement Benefits (Details) false false R67.htm 2420402 - Disclosure - Asset Retirement Obligation By Type (Details) Sheet http://nvenergy.com/role/AssetRetirementObligationByTypeDetails Asset Retirement Obligation By Type (Details) false false R68.htm 2420403 - Disclosure - Asset Retirement Obligations Change in Asset Retirement Obligations (Details) Sheet http://nvenergy.com/role/AssetRetirementObligationsChangeInAssetRetirementObligationsDetails Asset Retirement Obligations Change in Asset Retirement Obligations (Details) false false R69.htm 2421402 - Disclosure - Commitments and Contingencies - Commitments Table (Details) Sheet http://nvenergy.com/role/CommitmentsAndContingenciesCommitmentsTableDetails Commitments and Contingencies - Commitments Table (Details) false false R70.htm 2421403 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://nvenergy.com/role/CommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) false false R71.htm 2424402 - Disclosure - Supplemental Cash Flow Disclosures (Details) Sheet http://nvenergy.com/role/SupplementalCashFlowDisclosuresDetails Supplemental Cash Flow Disclosures (Details) false false R72.htm 2425402 - Disclosure - Unaudited Quarterly Operating Results (Details) Sheet http://nvenergy.com/role/UnauditedQuarterlyOperatingResultsDetails Unaudited Quarterly Operating Results (Details) false false All Reports Book All Reports Element us-gaap_DebtInstrumentRedemptionPricePercentage had a mix of decimals attribute values: 0 3. Element us-gaap_DueFromAffiliateCurrent had a mix of decimals attribute values: -6 0. Element us-gaap_ExtinguishmentOfDebtAmount had a mix of decimals attribute values: -6 0. Element us-gaap_LineOfCredit had a mix of decimals attribute values: -6 0. Element us-gaap_LongTermDebtPercentageBearingVariableInterestRate had a mix of decimals attribute values: 0 5. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '1/1/2013 - 3/31/2013' is shorter (89 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '4/1/2013 - 6/30/2013' is shorter (90 days) and has only 1 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '7/1/2013 - 9/30/2013' is shorter (91 days) and has only 1 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '10/1/2013 - 12/31/2013' is shorter (91 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '1/1/2014 - 3/31/2014' is shorter (89 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '4/1/2014 - 6/30/2014' is shorter (90 days) and has only 1 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '7/1/2014 - 9/30/2014' is shorter (91 days) and has only 1 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 25 values. Shorter duration columns must have at least one fourth (6) as many values. Column '10/1/2014 - 12/31/2014' is shorter (91 days) and has only 2 values, so it is being removed. 'Monetary' elements on report '2411403 - Disclosure - Long-Term Debt - Narrative (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2418401 - Disclosure - Related Party Transactions (Details)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Consolidated Statements of Operations Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' Process Flow-Through: 1004000 - Statement - Consolidated Statements of Cash Flows npc-20141231.xml npc-20141231.xsd npc-20141231_cal.xml npc-20141231_def.xml npc-20141231_lab.xml npc-20141231_pre.xml true true