100000 - Document - Document and Entity Information
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100010 - Statement - CONSOLIDATED STATEMENTS OF INCOME
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100020 - Disclosure - Leases - Components of Lease Expense (Details) 2
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100030 - Disclosure - Leases - Summary of Maturities of Lease Liabilities (Details) 2
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100040 - Disclosure - Long-Term Debt - Schedule Of Long-Term Debt Maturities (Details) 2
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100050 - Disclosure - Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Details) 2
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100060 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
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100070 - Disclosure - Leases - Summary of Maturities of Lease Liabilities (Details) 3
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100080 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)
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100090 - Disclosure - Leases - Summary of Maturities of Lease Liabilities (Details) 4
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100100 - Statement - CONSOLIDATED BALANCE SHEETS
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100110 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)
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100120 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS
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100130 - Statement - CONSOLIDATED STATEMENTS OF EQUITY
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100140 - Disclosure - Summary of Significant Accounting Policies
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100150 - Disclosure - New Accounting Standards
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100160 - Disclosure - Balance Sheet Components
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100170 - Disclosure - Revenue
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100180 - Disclosure - Leases
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100190 - Disclosure - Variable Interest Entities
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100200 - Disclosure - Derivatives and Risk Management
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100210 - Disclosure - Jointly Owned Electric Facilities
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100220 - Disclosure - Property, Plant And Equipment
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100230 - Disclosure - Asset Retirement Obligations
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100240 - Disclosure - Pension Plans and Other Postretirement Benefit Plans
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100250 - Disclosure - Accounting For Income Taxes
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100260 - Disclosure - Energy Purchase Contracts
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100270 - Disclosure - Committed Lines of Credit
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100280 - Disclosure - Credit Agreement
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100290 - Disclosure - Long-Term Debt
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100300 - Disclosure - Long- Term Debt to Affiliated Trust
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100310 - Disclosure - Fair Value
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100320 - Disclosure - Common Stock
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100330 - Disclosure - Accumulated Other Comprehensive Loss
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100340 - Disclosure - Earnings Per Common Share Attributable to Avista Corporation Shareholders
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100350 - Disclosure - Commitments and Contingencies
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100360 - Disclosure - Regulatory Matters
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100370 - Disclosure - Information by Business Segments
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100380 - Disclosure - Termination of Proposed Acquisition by Hydro One
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100390 - Disclosure - Sale of METALfx
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100400 - Disclosure - Summary of Significant Accounting Policies (Policies)
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100410 - Disclosure - Summary of Significant Accounting Policies (Tables)
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100420 - Disclosure - Balance Sheet Components (Tables)
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100430 - Disclosure - Revenue (Tables)
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100440 - Disclosure - Leases (Tables)
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100450 - Disclosure - Derivatives and Risk Management (Tables)
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100460 - Disclosure - Jointly Owned Electric Facilities (Tables)
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100470 - Disclosure - Property, Plant And Equipment (Tables)
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100480 - Disclosure - Asset Retirement Obligations (Tables)
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100490 - Disclosure - Pension Plans and Other Postretirement Benefit Plans (Tables)
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100500 - Disclosure - Accounting For Income Taxes (Tables)
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100510 - Disclosure - Energy Purchase Contracts (Tables)
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100520 - Disclosure - Committed Lines of Credit (Tables)
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100530 - Disclosure - Long-Term Debt (Tables)
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100540 - Disclosure - Long- Term Debt to Affiliated Trust (Tables)
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100550 - Disclosure - Fair Value (Tables)
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100560 - Disclosure - Accumulated Other Comprehensive Loss (Tables)
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100570 - Disclosure - Earnings Per Common Share Attributable to Avista Corporation Shareholders (Tables)
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100580 - Disclosure - Regulatory Matters (Tables)
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100590 - Disclosure - Information by Business Segments (Tables)
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100600 - Disclosure - Summary of Significant Accounting Policies - Summary of Ratio of Depreciation to Average Depreciable Property and Average Service Lives for Utility Plan in Service (Details)
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100610 - Disclosure - Summary of Significant Accounting Policies - Summary of Effective AFUDC Rate (Details)
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100620 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)
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100630 - Disclosure - Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
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100640 - Disclosure - Summary of Significant Accounting Policies - Other Expense (Income) - Net (Details)
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100650 - Disclosure - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details)
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100660 - Disclosure - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Parenthetical) (Details)
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100670 - Disclosure - Summary of Significant Accounting Policies - Estimated Retirement Costs Collected from Customers (Details)
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100680 - Disclosure - Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Details)
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100690 - Disclosure - Summary of Significant Accounting Policies - Summary of Appropriated Retained Earnings Amount Included in Retained Earnings (Details)
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100700 - Disclosure - New Accounting Standards - Additional Information (Details)
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100710 - Disclosure - Balance Sheet Components - Materials and Supplies, Fuel Stock and Stored Natural Gas (Details)
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100720 - Disclosure - Balance Sheet Components - Schedule of Other Current Assets (Details)
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100730 - Disclosure - Balance Sheet Components - Other Property and Investments-Net and Other Non-current Assets (Details)
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100740 - Disclosure - Balance Sheet Components - Other Current Liabilities (Details)
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100750 - Disclosure - Balance Sheet Components - Schedule of Other Non-Current Liabilities and Deferred Credits (Details)
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100760 - Disclosure - Revenue - Unbilled Accounts Receivable (Details)
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100770 - Disclosure - Revenue - Schedule of Utilities Operating Revenue Expense Taxes (Details)
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100780 - Disclosure - Revenue - Additional Information (Details)
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100790 - Disclosure - Revenue - Disaggregation of Revenue (Details)
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100800 - Disclosure - Leases - Additional Information (Details)
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100810 - Disclosure - Leases - Components of Lease Expense (Details)
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100820 - Disclosure - Leases - Summary of Supplemental Cash Flow Information related to Leases (Details)
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100830 - Disclosure - Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Details)
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100840 - Disclosure - Leases - Summary of Maturities of Lease Liabilities (Details)
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100850 - Disclosure - Variable Interest Entities (Details)
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100860 - Disclosure - Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details)
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100870 - Disclosure - Derivatives and Risk Management - Additional Information (Details)
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100880 - Disclosure - Derivatives and Risk Management - Summary of Foreign Currency Exchange Derivatives (Details)
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100890 - Disclosure - Derivatives and Risk Management - Summary of Unsettled Interest Rate Swap Derivatives (Details)
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100900 - Disclosure - Derivatives and Risk Management - Schedules of Fair Values and Locations of Derivative Instruments (Details)
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100910 - Disclosure - Derivatives and Risk Management - Schedule of Collateral Outstanding Related to Derivative Instruments (Details)
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100920 - Disclosure - Jointly Owned Electric Facilities - Additional Information (Details)
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100930 - Disclosure - Jointly Owned Electric Facilities - Schedule of Utility Plant in Service for Colstrip And Accumulated Depreciation (Details)
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100940 - Disclosure - Property, Plant And Equipment - Schedule of Net Utility Property (Details)
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100950 - Disclosure - Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Details)
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100960 - Disclosure - Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Parenthetical) (Details)
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100970 - Disclosure - Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligation (Details)
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100980 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Additional Information (Details)
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100990 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Schedule of Expected Benefit Payments (Details)
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101000 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Change in Benefit Obligation and Plan Assets (Details)
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101010 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details)
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101020 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Investment Allocation Percentages By Asset Classes (Details)
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101030 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Schedule of Fair Value Hierarchy of pension Plan's Assets (Details)
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101040 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Schedule of Fair Value Hierarchy of Other Postretirement Plan Assets (Details)
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101050 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Employer Matching Contributions (Details)
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101060 - Disclosure - Pension Plans and Other Postretirement Benefit Plans - Deferred Compensation Assets and Liabilities (Details)
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101070 - Disclosure - Accounting For Income Taxes - Schedule of Components of Income Tax Expense (Details)
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101080 - Disclosure - Accounting For Income Taxes - Additional Information (Details)
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101090 - Disclosure - Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
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101100 - Disclosure - Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Details)
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101110 - Disclosure - Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details)
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101120 - Disclosure - Energy Purchase Contracts Additional Information (Details)
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101130 - Disclosure - Energy Purchase Contracts (Schedule Of Utility Total Expenses) (Details)
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101140 - Disclosure - Energy Purchase Contracts (Future Contractual Commitments For Power Resources And Natural Gas Resources) (Details)
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101150 - Disclosure - Energy Purchase Contracts (PUD Contracts Expenses) (Details)
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101160 - Disclosure - Committed Lines of Credit - Additional Information (Details)
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101170 - Disclosure - Committed Lines of Credit - Schedule of Balances Outstanding and Interest Rates of Borrowings (Details)
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101180 - Disclosure - Credit Agreement - Additional Information (Details)
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101190 - Disclosure - Long-Term Debt - Schedule Of Long-Term Debt Instruments (Details)
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101200 - Disclosure - Long-Term Debt - Schedule Of Long-Term Debt Instruments (Parenthetical) (Details)
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101210 - Disclosure - Long-Term Debt - Schedule Of Long-Term Debt Maturities (Details)
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101220 - Disclosure - Long-Term Debt- Additional Information (Details)
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101230 - Disclosure - Long- Term Debt to Affiliated Trust - Narrative (Details)
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101240 - Disclosure - Long-Term Debt to Affiliated Trust - Schedule of Distribution Rates Paid (Details)
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101250 - Disclosure - Fair Value - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments (Details)
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101260 - Disclosure - Fair Value - Additional Information (Details)
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101270 - Disclosure - Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details)
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101280 - Disclosure - Fair Value - Schedule of Quantitative Information (Details)
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101290 - Disclosure - Fair Value - Schedule of Activity For Energy Commodity Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Details)
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101300 - Disclosure - Fair Value - Schedules of Nonrecurring Fair Value Measurements (Details)
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101310 - Disclosure - Common Stock - Additional Information (Details)
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101320 - Disclosure - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Details)
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101330 - Disclosure - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details)
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101340 - Disclosure - Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details)
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101350 - Disclosure - Earnings Per Common Share Attributable to Avista Corporation Shareholders - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details)
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101360 - Disclosure - Earnings Per Common Share Attributable to Avista Corporation Shareholders - Additional Information (Details)
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101370 - Disclosure - Commitments and Contingencies - Additional Information (Details)
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101380 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details)
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101390 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Parenthetical) (Details)
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101400 - Disclosure - Regulatory Matters - Additional Information (Details)
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101410 - Disclosure - Regulatory Matters - Schedule of Decoupling and Earnings Sharing Mechanisms (Details)
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101420 - Disclosure - Information by Business Segments (Additional Information) (Details)
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101430 - Disclosure - Information by Business Segments - Schedule of Business Segments (Details)
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101440 - Disclosure - Termination of Proposed Acquisition by Hydro One - Additional Information (Details)
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101450 - Disclosure - Sale of METALfx- Additional Information (Details)
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