Credit Rating [Member] Credit Rating [Member] Credit Rating [Member] Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Contract Length, PPA Contract Length, PPA Contract Length, PPA Derivative [Table] Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Provision for credit loss expense 1 Accounts Receivable, Credit Loss Expense (Reversal) Long-term Debt, Gross Long-Term Debt, Gross Entity Address, Postal Zip Code Entity Address, Postal Zip Code Administrative Expense defined benefit plan expected administration expense defined benefit plan expected administration expense Debt Instrument [Axis] Debt Instrument [Axis] Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Power contract acquisition adjustment loss Power Contract Acquisition Adjustment Loss Non Current Long term fair value adjustment of the power contract acquisitions that will be recognized as income after one year. Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Total other property and investments Total Other Property And Investments Total other property and investments. Natural gas Regulated Operating Revenue, Gas Additional paid-in capital Additional Paid in Capital Gross Amounts Offset in the Statement of Financial Position Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Discounted cash flow [Member] Valuation, Income Approach [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Rate Plan, number of years Rate Plan, number of years Rate Plan, number of years Other Payments for (Proceeds from) Other Investing Activities Statistical Measurement [Domain] Statistical Measurement [Domain] Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Regulatory Assets and Liabiliaties [Line Items] Regulatory Assets and Liabiliaties [Line Items] Regulatory Assets and Liabiliaties [Line Items] Maximum Power Maximum Power [Member] Maximum Power Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Derivative Instruments, Gain (Loss) [Table Text Block] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other non-cash Other Noncash Income (Expense) Fair Value Measurements, Sensitivity Analysis, Hypothetical Increase or Decrease of Market Prices, Result on Fair Value Fair Value Measurements, Sensitivity Analysis, Hypothetical Increase or Decrease of Market Prices, Result on Fair Value Fair Value Measurements, Sensitivity Analysis, Hypothetical Increase or Decrease of Market Prices, Result on Fair Value Net income (loss) Net Income (loss) Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Under-collection [Member] Under-collection [Member] Under-collection Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Leases Lessee, Finance Leases [Text Block] Regulatory liabilities related to power contracts Regulatory Liabilities Related To Power Contracts Liabilities incurred for regulatory matters related to power contracts. Document Information [Line Items] Document Information [Line Items] Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Clearwater Wind Project Clearwater Wind Project [Member] Clearwater Wind Project Lessee, Operating Lease, Liability, Payment, Due [Abstract] Lessee, Operating Lease, Liability, to be Paid [Abstract] Storm that occurred in 2022 Storm that occurred in 2022 [Member] Storm that occurred in 2022 Equity Component [Domain] Equity Component [Domain] Scenario [Axis] Scenario [Axis] Assets, Fair Value Disclosure Assets, Fair Value Disclosure Residential Residential [Member] Residential Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] Long-term debt (fixed-rate), net of discount Long-term Debt, Fixed Rate, Net of Discount, Fair Value Disclosure Long-term Debt, Fixed Rate, Net of Discount, Fair Value Disclosure Other property and investments Other Property And Investments Other property and investments Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Long-term Debt, Excluding Current Maturities, Fair Value Disclosure Long-term Debt, Excluding Current Maturities, Fair Value Disclosure Long-term Debt, Excluding Current Maturities, Fair Value Disclosure Construction expenditures - excluding equity AFUDC Construction expenditures excluding equity allowance for funds used during construction The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use, excluding equity AFUDC. Annual Power Cost Variability Annual Power Cost Variability Annual Power Cost Variability Standby Letters of Credit Standby Letters of Credit [Member] Hedging Designation [Domain] Hedging Designation [Domain] Forward Value of Contract [Member] Forward Value of Contract [Member] Forward Value of Contract [Member] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Derivative Instrument [Axis] Derivative, by Nature [Axis] Derivative Instrument [Axis] Gross Amounts Offset in the Statement of Financial Position Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Power cost adjustment mechanism Power Cost Adjustment Mechanism Asset, Noncurrent Regulatory asset that provides for recovery of power costs from customers. Excess power costs or power cost savings will be apportioned between PSE and its customers. Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Schedule of PGA Receivable Payable Schedule of PGA Receivable Payable [Table Text Block] Schedule of PGA Receivable Payable Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Residential exchange Utilities Operating Expense, Residential Exchange Costs Changes in the current period carrying value of the residential exchange program. Entity Address, State or Province Entity Address, State or Province Hedging strategy number of years extended Hedging strategy number of years extended Hedging strategy number of years extended Public Utilities Property Plant And Equipment Gas Plant Public Utilities Property Plant And Equipment Gas Plant The period end book value of the gas plant. Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Annual Power Cost Variability, Interest Annual Power Cost Variability, Interest Annual Power Cost Variability, Interest Public Utilities Property Plant And Equipment Electric Plant Public Utilities Property Plant And Equipment Electric Plant The period end book value of the electric plant. Decoupling Mechanism [Member] Decoupling Mechanism [Member] Decoupling Mechanism [Member] Accounts receivable and unbilled revenue Increase (Decrease) in Accounts and Other Receivables Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Other Benefit [Member] Other Pension Plan [Member] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Operating lease liabilities Operating Lease, Liability, Current Operating Lease, Liability, Current Assets Derivative Assets Derivative Asset Variable Interest Entity, Payable Variable Interest Entity, Payable Variable Interest Entity, Payable Amortization of treasury interest rate swaps to earnings, net of tax of $26 and $26, respectively Amortization Of Financing Cash Flow Hedge Contracts To Earnings During Period Net Of Tax Net of tax effect, amortization for accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period. Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements UA represented [Member] UA represented [Member] UA represented Transmission and Transportation Transmission and Transportation [Member] Transmission and Transportation Supplemental Employee Retirement Plan [Member] Supplemental Employee Retirement Plan [Member] Aggregate expected contributions Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Other Retail Customer Other Retail Customer [Member] Other Retail Customer Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Total long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Subsidiaries [Member] Subsidiaries [Member] Geographical [Axis] Geographical [Axis] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Changes in Projected Benefit Obligations Schedule of Changes in Projected Benefit Obligations [Table Text Block] Electric generation fuel Utilities Operating Expense, Fuel Used Unrealized loss on derivative instruments Current, Liabilities Derivative Liability, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other property and investments: Other Property And Investments [Abstract] Commodity Contracts Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] AFUDC - equity AFUDC Equity The increase (decrease) during the reporting period in AFUDC-Equity. Equity component of allowance for funds used during constrution. Document Type Document Type Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Regulatory liabilities Regulatory Liabilities, Noncurrent Regulatory Liabilities, Noncurrent Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Segments [Axis] Segments [Axis] Debt Disclosure Debt Disclosure [Text Block] Finance Lease, Liability, Payment, Due [Abstract] Finance Lease, Liability, to be Paid [Abstract] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Public Utilities, Rate Case, Deferred Storm Qualifying Costs Public Utilities, Rate Case, Deferred Storm Qualifying Costs Public Utilities, Rate Case, Deferred Storm Qualifying Costs Materials and supplies Increase (Decrease) in Materials and Supplies Other deferred credits Other Deferred Credits Other deferred credits Out of Cycle PGA Out of Cycle PGA Out of Cycle PGA Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Document Period End Date Document Period End Date Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Total assets Assets Receivables charged-off Accounts Receivable, Allowance for Credit Loss, Writeoff Income Statement Location [Axis] Income Statement Location [Axis] Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Public Utilities, Approved Rate Increase (Decrease), Percentage Public Utilities, Approved Rate Increase (Decrease), Percentage Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Materials and supplies, at average cost Materials, Supplies, and Other Colstrip Units 1 and 2 [Member] Colstrip Units 1 and 2 [Member] Colstrip Units 1 and 2 [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Interest expense Interest Expense, Debt 4.224% Senior Secured Note Due 2032 4.224% Senior Secured Note Due 2032 [Member] 4.224% Senior Secured Note Due 2032 Salaries and wages Employee-related Liabilities, Current Common shareholder’s equity: Stockholders' Equity Attributable to Parent [Abstract] Prepaid expense and other Prepaid Expense and Other Assets, Current Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Segments [Domain] Segments [Domain] Deferred income taxes and tax credits, net Deferred Income Taxes and Tax Credits Natural Gas Natural Gas [Member] Customer [Axis] Customer [Axis] Defined Benefit Plan, Interest Cost Defined Benefit Plan, Interest Cost Finance lease liabilities Finance Lease, Liability, Noncurrent Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Fair Value Liability Derivative, Net Liability Position, Aggregate Fair Value Fuel and natural gas inventory Increase (Decrease) in Fuel Inventories Derivative Contract [Domain] Derivative Contract [Domain] Energy costs: Energy Costs [Abstract] Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Entity Registrant Name Entity Registrant Name Capitalization: Capitalization [Abstract] Capitalization [Abstract] Nonqualified Plan [Member] Nonqualified Plan [Member] Long-term Line of Credit, Noncurrent Long-Term Line of Credit, Noncurrent Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Power contract acquisition adjustment gain Power Contract Acquisition Adjustment Gain Current Current Fair Value adjustment of the power contract acquisitions, that will be recognized as income within one year. Entity Address, City or Town Entity Address, City or Town Pension and Other Postretirement Benefits Disclosure [Text Block] Retirement Benefits [Text Block] Purchased gas adjustment receivable purchase gas adjustment, long-term purchase gas adjustment, long-term Leases [Abstract] Leases [Abstract] Operating expenses: Operating Expenses [Abstract] Additional Collateral, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Low [Member] Minimum [Member] Interest charges: Interest Costs Incurred [Abstract] Restricted cash Restricted Cash and Cash Equivalents, Current Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Regulatory assets related to power contracts Regulatory Assets Related To Power Contracts Regulatory assets recorded in relation to power contracts Net unrealized (gain) loss on derivative instruments Unrealized Gain (Loss) on Derivatives Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Investment, Name [Axis] Investment, Name [Axis] Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Qualified Pension Benefits [Member] Pension Plan [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Entity File Number Entity File Number Loss Contingency, Range of Possible Loss, Portion Not Accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Customer's share plus interest Customer's share plus interest [Member] Customer's share plus interest Interest Interest Payable, Current Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Tacoma LNG [Member] Tacoma LNG [Member] Tacoma LNG [Member] Commercial Commercial [Member] Commercial Entity Information [Line Items] Entity Information [Line Items] Total other long-term and regulatory assets Total Longterm And Regulatory Assets Total of all long term and regulatory assets. Proceeds from Lines of Credit Proceeds from Lines of Credit Schedule of Graduated Scale of Rate Adjustment Mechanism Schedule of Graduated Scale of Rate Adjustment Mechanism [Table Text Block] Schedule of Graduated Scale of Rate Adjustment Mechanism Total operating revenue Regulated and Unregulated Operating Revenue Other income (expense): Other Nonoperating Income (Expense) [Abstract] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Defined Contribution Plan, by Name [Axis] Defined Contribution Plan, by Name [Axis] Defined Contribution Plan, by Name [Axis] Parent Company [Member] Parent Company [Member] Accounts payable Increase (Decrease) in Accounts Payable Revenues Revenues Schedule of Regulatory Assets and Liabiliaties [Table] Schedule of Regulatory Assets and Liabiliaties [Table] Schedule of Regulatory Assets and Liabiliaties [Table] Operating Costs and Expenses Operating Costs and Expenses Cash payments for interest (net of capitalized interest) Interest Paid, Excluding Capitalized Interest, Operating Activities Purchased gas adjustment increase (decrease) in purchased gas increase (decrease) in purchased gas Summary of Consolidation Policy Schedule of Capitalization, Equity [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Line of Credit Facility, Maximum Amount Outstanding During Period Line of Credit Facility, Maximum Amount Outstanding During Period Construction in Progress, Gross Construction in Progress, Gross Regulatory assets and liabilities Increase (Decrease) in Regulatory Assets and Liabilities Total common shareholder’s equity Beginning Balance Ending Balance Stockholders' Equity Attributable to Parent Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Accounting for Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Public Utilities Property Plant And Equipment Common Plant Public Utilities Property Plant And Equipment Common Plant The period end book value of the common plant. Dividends, Common Stock Dividends, Common Stock Derivative Instruments, (Loss) Gain [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity Interactive Data Current Entity Interactive Data Current Change in certain current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Collective Bargaining Arrangement [Domain] Collective-Bargaining Arrangement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Dividends paid Payments of Dividends Retained Earnings [Member] Retained Earnings [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Regulatory Assets (Liabilities) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Regulatory Assets (Liabilities) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Regulatory Assets (Liabilities) Derivative [Line Items] Offsetting Assets and Liabilities [Line Items] [Line Items] for Offsetting Assets and Liabilities [Table] Common Stock [Member] Common Stock [Member] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Project [Domain] Project [Domain] First mortgage bonds and senior notes Senior Notes, Noncurrent Golden Hills Wind Farm Golden Hills Wind Farm [Member] Golden Hills Wind Farm Commercial Paper Commercial Paper Purchased natural gas adjustment, interest Purchased natural gas adjustment, interest Purchased natural gas adjustment, interest Utility Plant [Abstract] Utility Plant [Abstract] Debt Instrument, Increase, Accrued Interest Debt Instrument, Increase, Accrued Interest Statement [Table] Statement [Table] Document Quarterly Report Document Quarterly Report Unrealized (gain) loss on derivative instruments, net Unrealized (gain) loss on derivative instruments Gain (Loss) on Derivative Instruments, Net, Pretax Current assets: Assets, Current [Abstract] Operating lease liabilities Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Defined Contribution Plan, Interest Credit Defined Contribution Plan, Interest Credit Defined Contribution Plan, Interest Credit Fair Value Inputs, Liabilities, Quantitative Information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Purchased Gas Adjustment Liability, Long-term Purchased Gas Adjustment Liability, Long-term Purchased Gas Adjustment Liability, Long-term Statistical Measurement [Axis] Statistical Measurement [Axis] Storm Damage Costs Deferred During Period Storm Damage Costs Deferred During Period Storm Damage Costs Deferred During Period Retained earnings Retained Earnings (Accumulated Deficit) Customer's share [Member] Customer's share [Member] Customer's share External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Accounts receivable, net of allowance for doubtful accounts of $44,228 and $41,962, respectively Accounts Receivable, after Allowance for Credit Loss, Current Purchased natural gas costs, credit for CP settlement Purchased natural gas costs, credit for CP settlement Purchased natural gas costs, credit for CP settlement Equity Components [Axis] Equity Components [Axis] Scenario [Domain] Scenario [Domain] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Commodity Contracts Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Purchased natural gas Utilities Operating Expense, Gas and Petroleum Purchased Requested Credit for Adequate Assurance [Member] Requested Credit for Adequate Assurance [Member] Requested Credit for Adequate Assurance [Member] Electricity Electricity [Member] Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Document Fiscal Year Focus Document Fiscal Year Focus Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] Purchased Electricity [Member] Purchased Electricity [Member] Purchased Electricity [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Electric Portfolio [Member] Electric Portfolio [Member] Electric Portfolio [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] New Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Operating lease right-of-use asset Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Offsetting Assets and Liabilities Offsetting Assets and Liabilities [Table Text Block] Offsetting Assets and Liabilities [Table Text Block] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Total Other Revenue Total Other Revenue Total Other Revenue Document Transition Report Document Transition Report Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Other regulatory assets Other Regulatory Assets Carrying amount as of the balance sheet date of other capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Local Phone Number Local Phone Number Total long-term and regulatory liabilities Total Longterm And Regulatory Liabilities Total of all long term and regulatory liabilities. Total capitalization Capitalization, Long-Term Debt and Equity Operating income (loss) Operating Income (Loss) Senior Secured Note Senior Secured Note [Member] Senior Secured Note Prepayments and other Increase (Decrease) in Prepaid Expense and Other Assets Document Information [Table] Document Information [Table] Common Stock, Shares, Outstanding Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Goodwill Goodwill Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Income tax (benefit) expense Income Tax Expense (Benefit) Geographical [Domain] Geographical [Domain] Income Statement [Abstract] Income Statement [Abstract] Area of Service Territory (in sqmi) Area of Service Territory Area of Service Territory Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Amortization of treasury interest rate swaps to earnings, net of tax Amortization of Financing Cash Flow Hedge Contracts to Earnings Tax Amortization of Financing Cash Flow Hedge Contracts to Earnings Tax Document Fiscal Period Focus Document Fiscal Period Focus Derivative [Line Items] Derivative [Line Items] Cash Collateral Posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Derivative Liability Derivative Liability Derivative Liability Purchased Gas Adjustment, Schedule 101 Purchased Gas Adjustment, Schedule 101 [Member] Purchased Gas Adjustment, Schedule 101 Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Employee groups [Domain] Employee groups [Domain] Employee groups Gross Amount Recognized in the Statement of Financial Position Derivative Liability, Subject to Master Netting Arrangement, before Offset Summary of Consolidation Policy Schedule of Capitalization, Equity [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Storm Damage Costs Incurred During Period Storm Damage Costs Incurred During Period Storm Damage Costs Incurred During Period Common stock $0.01 par value, 1,000 shares authorized, 200 shares outstanding Common Stock, Value, Issued Carrying Value [Member] Reported Value Measurement [Member] CAPITALIZATION AND LIABILITIES Capitalization, Long-Term Debt and Equity [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Electricity, US Regulated [Member] Electricity, US Regulated [Member] Annual Power Cost Variability, by Recovery Type [Axis] Annual Power Cost Variability, by Recovery Type [Axis] Annual Power Cost Variability, by Recovery Type [Axis] Purchased natural gas costs, recoverable Purchased natural gas costs, recoverable Purchased natural gas costs, recoverable Storm that occurred in 2021 Storm that occurred in 2021 [Member] Storm that occurred in 2021 Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Gain (loss) on derivatives Unrealized Gain (Loss) on Derivatives and Commodity Contracts Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Other expense Other Nonoperating Expense Impairment of Intangible Assets, Finite-lived Impairment of Intangible Assets, Finite-Lived Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Natural Gas Derivatives [Member] Natural Gas Derivatives [Member] Natural Gas Derivatives [Member] Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Current liabilities: Liabilities, Current [Abstract] Proceeds from long-term debt and bonds issued Proceeds from Issuance of Long-Term Debt Equity Method Investments Equity Method Investments employer contribution [Member] employer contribution [Member] employer contribution [Member] Accounts payable for capital expenditures eliminated from cash flows Capital Expenditures Incurred but Not yet Paid Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Retirement Plan Type [Domain] Retirement Plan Type [Domain] Income Statement Location [Domain] Income Statement Location [Domain] Taxes other than income taxes Utilities Operating Expense, Taxes Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Liabilities: Offsetting Derivative Liabilities [Abstract] Amendment Flag Amendment Flag Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Purchased electricity Utilities Operating Expense, Purchased Power Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Net unrealized gain (loss) from pension and postretirement plans, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Entity Current Reporting Status Entity Current Reporting Status Other Other Liabilities, Current Other Other Assets, Noncurrent Other long-term and regulatory liabilities: Longterm And Regulatory Liabilities [Abstract] Public Utilities, Rate Case, Deferred Storm Costs Threshold Public Utilities, Rate Case, Deferred Storm Costs Threshold Public Utilities, Rate Case, Deferred Storm Costs Threshold Depreciation and amortization Depreciation, Depletion and Amortization Fuel and natural gas inventory, at average cost Fuel And Gas Inventory At Average Cost The carrying amount of the fuel and gas inventory used in the generation of electricity and for future sales to the Company's natural gas customers, calculated using the average cost method, as of the balance sheet date. Qualified Plan [Member] Qualified Plan [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] PCA Mechanism [Member] PCA Mechanism [Member] PCA Mechanism [Member] Commodity Contract [Member] Commodity Contract [Member] Project [Axis] Project [Axis] Derivative [Table] Derivative [Table] IBEW represented IBEW represented [Member] IBEW represented Regulation and Rates [Table] Regulation and Rates [Table] Regulation and Rates [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Remaining Contract Term, PLNG Remaining Contract Term, PLNG Remaining Contract Term, PLNG Companys share [Member] Companys share [Member] Companys share Net Amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Entities [Table] Entities [Table] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Net utility plant Public Utilities, Property, Plant and Equipment, Net Net unrealized gain (loss) from pension and postretirement plans, net of tax of $10 and $953, respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Regulatory liability for deferred income taxes Deferred Tax Liabilities, Regulatory Assets and Liabilities Common stock, shares authorized (in shares) Common Stock, Shares Authorized Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total operating expenses Operating Expenses High [Member] Maximum [Member] Maximum [Member] Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Natural Gas Portfolio [Member] Natural Gas Portfolio [Member] Natural Gas Portfolio [Member] External Credit Rating, Non Investment Grade [Member] External Credit Rating, Non Investment Grade [Member] Working Capital Needs [Member] Working Capital Needs [Member] Working Capital Needs [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Total current assets Assets, Current Taxes Taxes Payable, Current Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Entity Small Business Entity Small Business Measurement Basis [Axis] Measurement Basis [Axis] Other [Abstract] Other [Abstract] Other [Abstract] Conservation amortization Utilities Operating Expense, Conservation Amortization The amount of expense recognized in the current period that reflects the allocation of conservation expenditures over the perscribed amortzation period. Annual Power Cost Variability, by Party [Domain] Annual Power Cost Variability, by Party [Domain] Annual Power Cost Variability, by Party [Domain] Measurement Frequency [Domain] Measurement Frequency [Domain] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Operating revenue: Revenues [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Significant Accounting Policies Significant Accounting Policies [Text Block] Annual Power Cost Variability, Range [Domain] Annual Power Cost Variability, Range [Domain] [Domain] for Annual Power Cost Variability, Range [Axis] Skookumchuck Wind Energy Project Skookumchuck Wind Energy Project [Member] Skookumchuck Wind Energy Project Long-term debt Other Long-Term Debt, Noncurrent Short-term debt Short-Term Debt Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Lessee, Operating Lease, Description [Abstract] Lessee, Operating Lease, Description [Abstract] Utility operations and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Derivative, Credit Risk Exposure, Percentage Derivative, Credit Risk Exposure, Percentage Derivative, Credit Risk Exposure, Percentage Debt Instrument [Line Items] Debt Instrument [Line Items] Unrealized gain on derivative instruments Long-term, Assets Derivative Asset, Noncurrent Other income Other Nonoperating Income Jointly Owned Non-Utility Plant Share Jointly Owned Non-Utility Plant Share Jointly Owned Non-Utility Plant Share Fair Value [Member] Estimate of Fair Value Measurement [Member] Industrial Industrial [Member] Industrial Puget LNG [Member] Puget LNG [Member] Puget LNG [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Pollution control bonds Long-Term Pollution Control Bond Electric Generation Fuel [Member] Electric Generation Fuel [Member] Electric Generation Fuel [Member] Over-collection [Member] Over-collection [Member] Over-collection Price (per MWh) Fair Value Inputs, Price Per Megawatt-Hour Fair Value Inputs, Price Per Megawatt-Hour Accounts payable Accounts Payable, Current Less: Accumulated depreciation and amortization Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Miscellaneous Customer Miscellaneous Customer [Member] Miscellaneous Customer Hedging Designation [Axis] Hedging Designation [Axis] Regulation and Rates [Abstract] Regulation and Rates [Abstract] External Credit Rating, Investment Grade [Member] External Credit Rating, Investment Grade [Member] Entity Filer Category Entity Filer Category Financial Support to Nonconsolidated Legal Entity [Domain] Financial Support to Nonconsolidated Legal Entity [Domain] Ownership interest (percent) Equity Method Investment, Ownership Percentage Liabilities: Liabilities, Fair Value Disclosure [Abstract] Colstrip Units 3 and 4 [Member] Colstrip Units 3 and 4 [Member] Colstrip Units 3 and 4 [Member] Commitments and contingencies (Note 8) Commitments and Contingencies Electric Regulated Operating Revenue, Electric, Non-Nuclear Other long term assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net AFUDC Public Utilities, Allowance for Funds Used During Construction, Additions Construction work in progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Long-term debt, Principal Long-term debt, Principal Long-term debt, Principal Fair Value Inputs, Assets and Liabilities, Quantitative Information Fair Value Inputs, Assets and Liabilities, Quantitative Information [Table Text Block] Fair Value Inputs, Assets and Liabilities, Quantitative Information [Table Text Block] Taxes payable Increase (Decrease) in Income Taxes Payable Purchased natural gas costs Purchased natural gas costs Purchased natural gas costs Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined Benefit Plan, Service Cost Defined Benefit Plan, Service Cost Financial Support to Nonconsolidated Legal Entity [Axis] Financial Support to Nonconsolidated Legal Entity [Axis] General Rate Case [Member] General Rate Case [Member] General Rate Case [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Cover [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Beginning balance Total ending allowance balance Accounts Receivable, Allowance for Credit Loss Revenue Revenue from Contract with Customer [Text Block] Range 2 [Member] Range 2 [Member] Range 2 Other Unregulated Operating Revenue Notes Receivable, Fair Value Disclosure Notes Receivable, Fair Value Disclosure Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Schedule of Credit Risk Related Contingent Features Schedule of Credit Risk Related Contingent Features [Table Text Block] Schedule of Credit Risk Related Contingent Features [Table Text Block] Contractual Obligation Contractual Obligation Forecast [Member] Forecast [Member] Unrealized gain on derivative instruments Current, Assets Derivative Asset, Current Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Amortization of Gain (Loss) Total capitalization and liabilities Liabilities and Equity Purchased Gas Adjustment [Member] Purchased Gas Adjustment [Member] Purchased Gas Adjustment Jointly Owned Non-Utility Plant, Ownership Amount of Other Assets Jointly Owned Non-Utility Plant, Ownership Amount of Other Assets Jointly Owned Non-Utility Plant, Ownership Amount of Other Assets Defined Contribution Plan, by Name [Domain] Defined Contribution Plan, by Name [Domain] Defined Contribution Plan, by Name [Domain] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Extinguishment of Debt, Amount Extinguishment of Debt, Amount Bad Debt Deferral, COVID 19 Bad Debt Deferral, COVID 19 Bad Debt Deferral, COVID 19 Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Unbilled revenue Unbilled Revenues Operating utility revenues, recorded on the basis of services rendered, which have not been billed as of the balance sheet date. Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Regulatory Assets [Line Items] Regulatory Asset [Line Items] Variable Interest Entity, Measure of Activity, Expense Variable Interest Entity, Measure of Activity, Expense Current Fiscal Year End Date Current Fiscal Year End Date Public Utilities, Approved Equity Capital Structure, Percentage Public Utilities, Approved Equity Capital Structure, Percentage Storm that occurred in 2023 Storm that occurred in 2023 [Member] Storm that occurred in 2023 Total current liabilities Liabilities, Current Lessee, Finance Lease, Description [Abstract] Lessee, Finance Lease, Description [Abstract] Annual Power Cost Variability, Amount Annual Power Cost Variability, Amount Annual Power Cost Variability, Amount Other Revenue From Contracts with Customers [Member] Other Revenue From Contracts with Customers [Member] Other Revenue From Contracts with Customers [Member] - for use in 606 quantitative disclosure Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Collective Bargaining Arrangement [Member] Collective Bargaining Arrangement [Member] Collective Bargaining Arrangement Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Range 1 [Member] Range 1 [Member] Range 1 Assets: Offsetting Derivative Assets [Abstract] Gross Amount Recognized in the Statement of Financial Position Derivative Asset, Subject to Master Netting Arrangement, before Offset purchased gas adjustment, Schedule 106 106B Purchased Gas Adjustment, Schedule 106 & 106B [Member] Purchased Gas Adjustment, Schedule 106 & 106B Entity Address, Address Line One Entity Address, Address Line One Net Amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Posted Collateral Collateral Already Posted, Aggregate Fair Value Annual Power Cost Variability, by Party [Axis] Annual Power Cost Variability, by Party [Axis] Annual Power Cost Variability, by Party [Axis] Annual Power Cost Variability, by Recovery Type [Domain] Annual Power Cost Variability, by Recovery Type [Domain] Annual Power Cost Variability, by Recovery Type [Domain] Other Proceeds from (Payments for) Other Financing Activities Long-term debt: Long-Term Debt, Excluding Current Maturities [Abstract] Power contract acquisition adjustment loss Power Contract Acquisition Adjustment Loss Current Current fair value adjustment of the power contract acquisitions that will be recognized as income within one year. Product and Service [Axis] Product and Service [Axis] Non-utility expense and other Nonutility Expense And Other The amount of unregulated operating and other expenses recognized during the period. Other Regulated Operating Revenue, Other Long-term debt (variable-rate) Long-term Debt, Variable Rate, Net of Discount, Fair Value Disclosure Long-term Debt, Variable Rate, Net of Discount, Fair Value Disclosure Change in short-term debt, net Proceeds from (Repayments of) Short-Term Debt Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Cash Collateral Received Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Entity Tax Identification Number Entity Tax Identification Number Debt issuance costs Unamortized Debt Issuance Expense Deferred income taxes Deferred Tax and Other Liabilities, Noncurrent Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Collective Bargaining Arrangement [Axis] Collective-Bargaining Arrangement [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Fair Value Inputs, Price Per Millions of BTU Fair Value Inputs, Price Per Millions of BTU Fair Value Inputs, Price Per Millions of BTU Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Public Utilities, Property, Plant and Equipment, Generation or Processing Public Utilities, Property, Plant and Equipment, Generation or Processing Regulation and Rates Disclosure Regulation and Rates Disclosure [Text Block] The entire disclosure of the events that have or may impact rates including, but not limited to, pending or recently concluded regulatory proceedings. Annual Power Cost Variability, Range [Axis] Annual Power Cost Variability, Range [Axis] Annual Power Cost Variability, Range [Axis] Entity Central Index Key Entity Central Index Key 5.625% Senior Secured Note Due 2022 5.625% Senior Secured Note Due 2022 [Member] 5.625% Senior Secured Note Due 2022 Measurement Frequency [Axis] Measurement Frequency [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Debt discount issuance costs and other Debt discount and other Debt instrument unamortized discount and fair value adjustment of debt instrument, net. Accrued expenses: Accrued Expenses [Abstract] Public Utilities, Approved Debt Capital Structure, Net of Tax, Percentage Public Utilities, Approved Debt Capital Structure, Net of Tax, Percentage Public Utilities, Approved Debt Capital Structure, Net of Tax, Percentage Other long-term and regulatory assets: Other Longterm And Regulatory Assets [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Other Increase (Decrease) in Other Accounts Payable and Accrued Liabilities City Area Code City Area Code ASSETS Assets [Abstract] Range 3 [Member] Range 3 [Member] Range 3 Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Regulation and Rates [Line Items] Regulation and Rates [Line Items] Regulation and Rates [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Line of Credit, Current Line of Credit, Current Public Utilities, Approved Debt Capital Structure, Percentage Public Utilities, Approved Debt Capital Structure, Percentage Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Power Cost Only Rate Case Power Cost Only Rate Case [Member] Power Cost Only Rate Case Non-cash financing and investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Unrealized (Gain) Loss on Derivative Instruments, Net [Member] Unrealized (Gain) Loss on Derivative Instruments, Net [Member] Unrealized (Gain) Loss on Derivative Instruments, Net [Member] Natural Gas, US Regulated [Member] Natural Gas, US Regulated [Member] Employee groups [Axis] Employee groups [Axis] Employee groups Compliance obligation Emission compliance obligation Emission compliance obligation Wholesale Wholesale [Member] Wholesale Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Weighted Average [Member] Weighted Average [Member] Defined Benefit Plan, Benefit Obligation, Beginning Balance Defined Benefit Plan, Benefit Obligation, Ending Balance Defined Benefit Plan, Benefit Obligation Power contract acquisition adjustment gain Power Contract Acquisition Adjustment Non Current Current Fair Value adjustment of the power contract acquisitions, that will be recognized as income after one year. Customer [Domain] Customer [Domain] Fair Value measurement, sensitivity analysis, hypothetical increase or decrease of market prices, result on fair value Fair Value measurement, sensitivity analysis, hypothetical increase or decrease of market prices, result on fair value, percent Fair Value measurement, sensitivity analysis, hypothetical increase or decrease of market prices, result on fair value, percent Unrealized loss on derivative instruments Long-term, Liabilities Derivative Liability, Noncurrent