Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Total Capitalization Capitalization, Long-Term Debt and Equity Commodity Contracts Commodity Contract [Member] Expected Return on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Award Timing Predetermined Award Timing Predetermined [Flag] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Entity File Number Entity File Number Paid In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Income Taxes – Net Other Comprehensive Income (Loss), Tax Basic: Earnings Per Share, Basic [Abstract] Share Repurchases Share Repurchases Under Repurchase Plan, Not Retired, Value Share Repurchases Under Repurchase Plan, Not Retired, Value Regulatory Assets and Liabilities, Other Disclosures [Abstract] Regulatory Assets and Liabilities, Other Disclosure [Abstract] After tax net hedging gains reclassified within twelve months Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months After Tax The estimated net amount of existing gains (loss) on cash flow hedges after tax at the reporting date expected to be reclassified to earnings within the next 12 months. Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net Income Available for Common Stock (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Liabilities: Liabilities, Fair Value Disclosure [Abstract] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Accounts Payable Increase (Decrease) in Accounts Payable, Trade Entity Listing, Par Value Per Share Entity Listing, Par Value Per Share Unbilled Revenue Unbilled Receivables, Current Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Schedule of Financial Segment Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Notes Payable to Banks and Commercial Paper Short-Term Debt Schedule of Cash, Cash Equivalents, and Restricted Cash Schedule of Cash and Cash Equivalents [Table Text Block] Share Repurchases Share Repurchases [Policy Text Block] Describes the entity's accounting policy for share repurchases. Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Over the Counter Swaps — Gas Over The Counter Swaps Gas [Member] Over The Counter Swaps Gas [Member] Adjustment to Compensation, Amount Adjustment to Compensation Amount Retirement Plan Pension Plan [Member] Schedule of Fair Value Measurements, Nonrecurring Fair Value Measurements, Nonrecurring [Table Text Block] Changes in Notes Payable to Banks and Commercial Paper Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock-Based Compensation Share-Based Payment Arrangement, Noncash Expense Recoverable Future Taxes Recoverable Future Taxes Regulatory assets representing future amounts collectible from customers corresponding to additional deferred income taxes not previously recorded because of ratemaking practices. Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Prepaid Property and Other Taxes Prepaid Taxes Rate adjustment to SOFR Debt Instrument, Rate Adjustment To SOFR Debt Instrument, Rate Adjustment To SOFR Beginning balance Ending balance Equity, Attributable to Parent Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Dividends on Common Stock Dividends Declared on Common Stock Dividends, Common Stock, Cash Impairment of Assets Impairment of Assets (Significant Non-Cash Item) Asset Impairment Charges Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Measurement Frequency [Axis] Measurement Frequency [Axis] Other Comprehensive Gains and Losses Before Reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Insider Trading Policies and Procedures [Line Items] NEW YORK NEW YORK Common stock, shares authorized (in shares) Common Stock, Shares Authorized Natural Gas Industrial Sales Natural Gas Industrial Sales [Member] Natural Gas Industrial Sales [Member] Common stock issued from sale of common stock (in shares) Common Stock Issued from Sale of Common Stock (in shares) Stock Issued During Period, Shares, New Issues Current Assets Assets, Current [Abstract] Total Capitalization and Liabilities Liabilities and Equity Fair Value, Recurring Fair Value, Recurring [Member] Funded Status of the Pension and Other Post-Retirement Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] CAPITALIZATION AND LIABILITIES Liabilities and Equity [Abstract] Credit risk exposure per counterparty Credit Risk Exposure Per Counterparty The credit risk exposure per counterparty. State Income Taxes Receivable State Income Taxes Payable State and Local Jurisdiction [Member] Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Cover [Abstract] Cover [Abstract] Cash Equivalents – Money Market Mutual Funds Cash and Cash Equivalents, Fair Value Disclosure Amounts Reclassified From Other Comprehensive Loss Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Expenditures for Additions to Long-Lived Assets Segment, Expenditure, Addition to Long-Lived Assets Accounting Policies [Abstract] Accounting Policies [Abstract] PENNSYLVANIA PENNSYLVANIA Amounts Payable to Customers Refundable Gas Costs Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Total Other Assets Total Other Assets Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer, excluding property, plant and equipment. Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Liabilities Liabilities [Abstract] Investment Holdings [Table] Investment Holdings [Table] Amount full cost ceiling exceeds book value of exploration and production properties Full Cost Ceiling Exceeds Book Value Of Exploration And Production Properties Full Cost Ceiling Exceeds Book Value Of Exploration And Production Properties Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income Before Income Taxes Total Before Income Tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Gathering Operation and Maintenance Expense Gathering, Operation And Maintenance Expense Utilities Operating Expense, Gathering, Operation And Maintenance Number of lenders Debt Instruments, Number Of Lenders Debt Instruments, Number Of Lenders Other Liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule of Other Investments Investment [Table Text Block] Operating Segments Operating Segments [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current Portion of Long-Term Debt Current portion of long-term debt Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Company's contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Natural Gas Gathering Service Natural Gas, Midstream [Member] Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Customer Security Deposits Security Deposit Liability Cost of Removal Regulatory Liability Cost of Removal Regulatory Liability Noncurrent regulatory liability representing amounts collected from customers through depreciation expense as of the end of the period. Through the rate making process, depreciation rates are established to recover the cost of property, plant and equipment as well as the cost of removing the property, plant and equipment from service at the end of its useful life. Name Measure Name Term Loan Agreement Term Loan Agreement [Member] Term Loan Agreement Capitalization Capitalization [Text Block] Capitalization [Text Block] Capitalized costs of unproved properties excluded from amortization Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization, Period Cost Deferred Income Taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Full cost ceiling test discount factor (as a percent) Full Cost Ceiling Test Discount Factor The discount factor used in the computation of the SEC full cost ceiling test that determines the limit of property acquisition, exploration and development costs that can be capitalized each period. Carrying Amount Long-Term Debt Total Assets Segment Assets: Assets Utility Utility [Member] Utility Segment Trading Symbol Trading Symbol Unamortized Debt Expense Unamortized Loss Reacquired Debt, Noncurrent Geographical [Domain] Geographical [Domain] Common Stock Issued Under Stock and Benefit Plans (in shares) Common stock issued (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Fair market value of derivative liability with a credit-risk related contingency Credit Risk Derivative Liabilities, at Fair Value Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Customer Security Deposits Increase (Decrease) in Security Deposits Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Public utilities, requested OPEB surcredit for customer refund Public Utilities, Requested Surcredit For Customer Refund Public Utilities, Requested Surcredit For Customer Refund Vesting of Restricted Stock Units Restricted Stock Units (RSUs) [Member] Income Statement and Other Comprehensive Income Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration Business Combination, Consideration Transferred Assets: Assets, Fair Value Disclosure [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Other Investments Other Investments Dividends Declared (in dollars per share) Dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Derivative Financial Instruments Derivative, Gain (Loss) on Derivative, Net Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total Net Assets/(Liabilities) Fair Value, Assets (Liabilities) Measured On Recurring Basis, Net Element represents the total of all the Company's net assets/(liabilities) that are measured at fair value on a recurring basis. Business Combination [Domain] Business Combination [Domain] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Additions Charged to Costs and Expenses Accounts Receivable, Credit Loss Expense (Reversal) Natural Gas Processing Natural Gas Processing [Member] Natural Gas Processing [Member] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Impairment of exploration and production properties Impairment Of Exploration And Production Properties The expense recorded to reduce the value of exploration and production properties accounted for under the full cost method of accounting to the cost center ceiling. Federal Income Taxes Receivable Federal Income Taxes Payable Internal Revenue Service (IRS) [Member] Prepaid Pension and Post-Retirement Benefit Costs Assets for Plan Benefits, Defined Benefit Plan Federal Income Taxes Payable Accrued Income Taxes, Current Change in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Earnings Reinvested in The Business Earnings Reinvested in the Business Retained Earnings [Member] Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Schedule of Other Accruals and Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash, Cash Equivalents, and Restricted Cash at October 1 Cash, Cash Equivalents, and Restricted Cash at March 31 Cash, Cash Equivalents, and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative asset Derivative Asset Income Tax Expense Income Tax Expense Income Tax Expense (Benefit) Income Tax Expense (Benefit) Spread on variable rate Debt Instrument, Basis Spread on Variable Rate Sale of Stock [Domain] Sale of Stock [Domain] Fair Value, Nonrecurring Fair Value, Nonrecurring [Member] Other Investments Investments, Fair Value Disclosure Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Property, Plant and Equipment Property, Plant and Equipment, Gross Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total Liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Hedging notional amount of forecasted transportation costs Derivative, Notional Amount Term Loan Facility, Commitment Letter Term Loan Facility, Commitment Letter [Member] Term Loan Facility, Commitment Letter Other Current Assets Increase (Decrease) in Other Current Assets Promissory Note Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Natural Gas Bcf Natural Gas Bcf [Member] Natural Gas BCf [Member] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Other Accruals and Current Liabilities Other Accruals and Current Liabilities Accrued Liabilities, Current Empire Empire [Member] Empire Requested base rate increase Public Utilities, Requested Rate Increase (Decrease), Amount Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] VEBA Trusts Veba Trusts [Member] Veba Trusts [Member] Upstream General and Administrative Expense General and Administrative Expense INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Fair Value of Derivative Financial Instruments Derivative Instruments and Hedges, Liabilities Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net Cash Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Director Equity Compensation Plan And Director And Officer DCP Plan Director Equity Compensation Plan And Director And Officer DCP Plan [Member] Director Equity Compensation Plan And Director And Officer DCP Plan Debt instrument, term Debt Instrument, Term Subsequent Event Subsequent Event [Member] Amortization of (Gains) Losses Defined Benefit Plan, Amortization of Gain (Loss) Stock and Benefit Plans Stock and Benefit Plans [Member] Stock and Benefit Plans Cash Flow Hedges Cash Flow Hedging [Member] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Estimated minimum liability for environmental remediation Loss Contingency, Estimate of Possible Loss PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Money Market Funds Money Market Funds [Member] Customer Advances Increase Decrease In Customer Advances Current The increase (decrease) during the reporting period in the amount of prepayments by customers from balanced billing programs. Derivative Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Gas Stored Underground Energy Related Inventory Gas Stored Underground Policy [Policy Text Block] Describes the entity's accounting policy for gas stored underground (current). This includes the carrying amount as of the balance sheet date of natural gas stored underground in depleted gas reservoirs, aquifers, or salt caverns to meet seasonal and peak load demands, and also as insurance against unforeseen supply disruptions, and deemed to be a current asset because it is expected to be used within twelve months or in the normal operating cycle. Income Taxes Receivable Income Taxes Receivable Equity Components [Axis] Equity Components [Axis] Additional increase in annual revenue requirement in third year Increase In Annual Revenue Requirement In Third Year Increase In Annual Revenue Requirement In Third Year Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total Common Stock Issued (in shares) Total Common Stock Issued During Period, Shares Total Common Stock Issued During Period, Shares Number of reportable segments Number of Reportable Segments Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Other Regulatory Liabilities Regulatory Liability, Noncurrent Customer Advances Customer Advances Prepayments received from customers from balanced billing programs. Entity Address, State or Province Entity Address, State or Province Total Current and Accrued Liabilities Liabilities, Current Increase estimated future net cash flows Effect on Future Cash Flows, Amount Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Total commitments under loan facilities Total Commitments Under Loan Facilities Total Commitments Under Loan Facilities Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Approved return on equity (as a percent) Public Utilities, Approved Return on Equity, Percentage Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Beginning Retained Earnings Unappropriated And Current Period Net Income Beginning Retained Earnings Unappropriated And Current Period Net Income Loss The sum of beginning retained earnings and current period net income or loss. Accrued Capital Expenditures Other Accrued Liabilities, Accrued Capital Expenditures Other Accrued Liabilities, Accrued Capital Expenditures Dividends Paid on Common Stock Payments of Ordinary Dividends, Common Stock Other Current Assets Other Current Assets Other Assets, Current Net Cash Used in Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Promissory note, face amount Short-Term Nonbank Loan and Note Payables Document Fiscal Year Focus Document Fiscal Year Focus Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Reduction of Long-Term Debt Repayments of Long-Term Debt Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Natural Gas Transportation Service Oil and Gas Service [Member] Property, Franchise and Other Taxes Taxes, Miscellaneous Business Segment Information Segment Reporting Disclosure [Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Gas Stored Underground Energy Related Inventory, Gas Stored Underground Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Components of Net Periodic Benefit Cost (Income) Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Pipeline and Storage Pipeline And Storage [Member] Pipeline and Storage Schedule of Components of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Other Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key Other Comprehensive Income (Loss), Before Tax: Other Comprehensive Income (Loss), before Tax [Abstract] PEO Name PEO Name Operating Revenues Total Revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Changes in Common Stock Equity Schedule of Stockholders Equity [Table Text Block] Credit Agreement Revolving Credit Facility [Member] Allowance for Uncollectible Accounts Accounts Receivable [Policy Text Block] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Dividends Per Common Share: Dividends, Common Stock [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Integrated Upstream and Gathering and Other Integrated Upstream and Gathering and Other [Member] Integrated Upstream and Gathering and Other Materials and Supplies - at average cost Inventory, Raw Materials and Supplies, Gross Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Capitalization, Long-term Debt and Equity [Abstract] Capitalization, Long-Term Debt and Equity [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] ASSETS Assets [Abstract] Long-Term Debt, Net of Current Portion and Unamortized Discount and Debt Issuance Costs Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Lease Operating Expense Oil and Gas, Production Cost, Period Cost Net Repurchases of Common Stock Under Stock and Benefit Plans Payments For Repurchase Of Common Stock Under Stock And Benefit Plans, Net Payments For Repurchase Of Common Stock Under Stock And Benefit Plans, Net FERC requested increase in settlement from rate proceeding FERC Requested Increase In Settlement From Rate Proceeding FERC Requested Increase In Settlement From Rate Proceeding Retirement Plan and Other Post-Retirement Benefits Retirement Benefits [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Premiums Paid on Early Redemption of Debt Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Consolidated Statements of Cash Flows Consolidated Statement Of Cash Flows [Policy Text Block] Describes the entity's accounting policy for the consolidated statement of cash flows. This includes a description of the cash and cash equivalents accounting policy with respect to unrestricted balances. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. In addition, cash equivalents include short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Long-term debt, interest rate Debt Instrument, Interest Rate, Stated Percentage Receivables, allowance for uncollectible accounts Accounts Receivable, Allowance for Credit Loss, Current Investment Type [Domain] Investments [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Over the Counter Swaps, No Cost Collars and Foreign Currency Forward Contracts Over the Counter Swaps, No Cost Collars and Foreign Currency Forward Contracts [Member] Over the Counter Swaps, No Cost Collars and Foreign Currency Forward Contracts [Member] Cash Held in Trust for Bondholders Asset, Held-in-Trust, Current Share Repurchase Plan Share Repurchase Plan [Member] Share Repurchase Plan Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Derivative Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Fair Value as of Grant Date Award Grant Date Fair Value Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Entity Registrant Name Entity Registrant Name Other Assets Increase (Decrease) in Other Noncurrent Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net Periodic Benefit Cost (Income) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Interest Expense Interest Expense, Other Share based compensation other than options grants in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Exploration and Production & Gathering Segments Exploration and Production & Gathering Segments [Member] Exploration and Production & Gathering Segments Total Operating Expenses Costs and Expenses Document Quarterly Report Document Quarterly Report Total Assets Assets, Fair Value Disclosure Deferred Income Taxes Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Relative shareholder return, performance cycle (in years) Relative Shareholder Return, Performance Cycle Relative Shareholder Return, Performance Cycle Investment Type [Axis] Investment Type [Axis] Interest Cost Defined Benefit Plan, Interest Cost All Other Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Granted in fiscal year, weighted average grant date fair value (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Operation and Maintenance Expense Utilities Operating Expense, Maintenance and Operations [Abstract] Payments to acquire businesses, gross Payments to Acquire Businesses, Gross Common Stock Issued Under Stock and Benefit Plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Pending Acquisition Acquisitions [Text Block] Acquisitions Accumulated Other Comprehensive Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Interest Expense on Long-Term Debt Interest Expense, Debt Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Sale of Stock [Axis] Sale of Stock [Axis] Name Trading Arrangement, Individual Name Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Award Type [Domain] Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Foreign Currency Contracts Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Defined Benefit Plans [Domain] Retirement Plan Type [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Schedule of Allowance for Uncollectible Accounts Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] After tax net hedging gains in accumulated other comprehensive income (loss) AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Earnings For Interim Periods Earnings For Interim Periods [Policy Text Block] Describes the entity's accounting policy for earnings for interim periods. The financial statements include all adjustments that are necessary for a fair statement of the results of operations for the reported periods. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total Net Assets/(Liabilities) Netting Adjustments Fair Value, Assets (Liabilities) Measured on Recurring Basis, Netting Adjustments Fair Value, Assets (Liabilities) Measured on Recurring Basis, Netting Adjustments INCOME Revenues [Abstract] Share-Based Payment Expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Additional increase in annual revenue requirement in second year Increase In Annual Revenue Requirement In Second Year Increase In Annual Revenue Requirement In Second Year Property, plant, and equipment, fair value Property, Plant, and Equipment, Fair Value Disclosure Fixed Income Mutual Fund Fixed Income Funds [Member] Liability Class [Axis] Liability Class [Axis] Acquisitions [Abstract] Acquisitions Revenues From External Customers Revenues, Excluding Intersegment Revenues Revenues, Excluding Intersegment Revenues Reporting Segment [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Vesting of Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Measurements, Fair Value Heirarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Gas Stored Underground and Materials and Supplies Increase (Decrease) in Inventories Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) Net Amortization And Deferral For Regulatory Purposes Including Volumetric Adjustments The Company's policy is to record retirement plan and other post-retirement benefit costs in the Utility segment on a volumetric basis to reflect the fact that the Utility segment experiences higher throughput of natural gas in the winter months and lower throughput of natural gas in the summer months. Pennsylvania Impact Fee Accrued Pennsylvania Impact Fee, Current Accrued Pennsylvania Impact Fee, Current Derivative Financial Instruments: Derivative Asset [Abstract] Other Assets Assets, Noncurrent [Abstract] Collateral received by the company Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Less - Accumulated Depreciation, Depletion and Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Company Selected Measure Name Company Selected Measure Name Reduction to annual revenue requirement for actuarial projections of pension and other-post retirement benefit income expected to be recognized Reduction To Annual Revenue Requirement For Actuarial Projections Of Pension And Other-Post Retirement Benefit Income Expected To Be Recognized Reduction To Annual Revenue Requirement For Actuarial Projections Of Pension And Other-Post Retirement Benefit Income Expected To Be Recognized Regulatory Liabilities Regulatory Liability, Current, Other Regulatory Liability, Current, Other Derivative Liability Netting Adjustments Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Public utilities, cap equivalent to distribution revenues, percentage Public Utilities, Cap Equivalent to Distribution Revenues, Percentage Public Utilities, Cap Equivalent to Distribution Revenues, Percentage Nonmonetary notional amount of price risk cash flow hedge derivatives, natural gas Nonmonetary Notional Amount Of Price Risk Cash Flow Hedge Derivatives, Natural Gas Nonmonetary notional amount of price risk cash flow hedge derivatives, natural gas. Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts Payable Accounts Payable, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other Comprehensive Income (Loss), Before Tax Other Comprehensive Income (Loss), before Tax All Executive Categories All Executive Categories [Member] Common Stock, $1 Par Value; Authorized - 200,000,000 Shares; Issued and Outstanding - 95,027,447 Shares and 90,379,095 Shares, Respectively Common Stock, Value, Issued Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Used in Diluted Calculation (shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and Contingencies (Note 8) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] FERC requested annual cost of service FERC Requested Annual Cost Of Service FERC Requested Annual Cost Of Service Taxes Refundable to Customers Taxes Refundable to Customers Noncurrent regulatory liability representing the reduction of previously recorded deferred income taxes associated with rate-regulated activities that are expected to be refundable to customers as of the end of the period. Business Combination [Axis] Business Combination [Axis] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Maximum credit risk exposure per counterparty Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Prepayments Other Prepaid Expense, Current Entity Small Business Entity Small Business Shares Tendered to Pay Withholding Taxes on Stock-Based Compensation Awards Stock-Based Compensation Awards [Member] Stock-Based Compensation Awards Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] All Other Operation and Maintenance Expense Other Cost and Expense, Operating Schedule of Capitalization, Equity [Table] Capitalization, Equity [Table] Document Transition Report Document Transition Report Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Interest Payable on Long-Term Debt Interest Payable on Long-Term Debt Carrying value as of the balance sheet date of [accrued] interest payable on long-term debt that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Underlying Securities Award Underlying Securities Amount Number of counterparties in net gain position Number Of Counterparties In Net Gain Position Number Of Counterparties In Net Gain Position Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Income Taxes Income Tax Disclosure [Text Block] Diluted: Earnings Per Share, Diluted [Abstract] Balance at Beginning of Period Balance at End of Period Accounts Receivable, Allowance for Credit Loss Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Schedule of Cash Flow Hedges Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Fair Value Debt Instrument, Fair Value Disclosure Over the Counter No Cost Collars – Gas Over the Counter No Cost Collars - Gas [Member] Over the Counter No Cost Collars - Gas [Member] Scenario [Axis] Scenario [Axis] Total Comprehensive Shareholders’ Equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest 5.50% Through October 2026 Five Point Five Percent Notes Due October First Two Thousand Twenty Six [Member] Five Point Five Percent Notes Due October First Two Thousand Twenty Six Hedging Collateral Deposits Margin Deposit Assets Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Paid in Capital Additional Paid in Capital Increase in annual revenue requirement in first year Increase In Annual Revenue Requirement In First Year Increase In Annual Revenue Requirement In First Year Product and Service [Axis] Product and Service [Axis] Receivables – Net of Allowance for Uncollectible Accounts of $24,017 and $17,099, Respectively Accounts and Other Receivables, Net, Current Derivative Contract Type [Domain] Derivative Contract [Domain] Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Net Proceeds from Common Stock Sale Net proceeds from common stock sale Proceeds from Issuance of Common Stock Capitalized costs relating to exploration and production activities, net Oil and Gas, Capitalized Cost, after Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance Total Revenues from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax Sale of Common Stock Sale of Common Stock [Member] Sale of Common Stock All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Intersegment Revenues Intersegment Revenues Intersegment Revenues Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Receivables and Unbilled Revenue Increase (Decrease) in Receivables Capital Expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total Current Assets Assets, Current Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Fair Value of Derivative Financial Instruments Derivative Instruments and Hedges, Noncurrent Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Hedge duration Derivative, Term of Contract Regulatory Assets Regulatory Asset, Current Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Rate plan period Rate Plan, Period Rate Plan, Period Share Repurchase Program [Domain] Share Repurchase Program [Domain] Current and Accrued Liabilities Liabilities, Current [Abstract] Geographical [Axis] Geographical [Axis] Derivative Financial Instruments: Derivative Liability [Abstract] Natural Gas Residential Sales Natural Gas Residential Sales [Member] Natural Gas Residential Sales [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Other All Other Segments and Reconciling Items [Member] All Other Segments and Reconciling Items Level 1 Fair Value, Inputs, Level 1 [Member] Deferred Charges Deferred Costs, Noncurrent Other Accruals and Current Liabilities Increase (Decrease) in Accrued Liabilities Schedule of Long-Term Debt Long Term Debt Fair Market Value [Table Text Block] This item represents the fair market value of long-term debt, including current portion Net Income Available for Common Stock (in dollars per share) Earnings Per Share, Diluted Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Title of 12(b) Security Title of 12(b) Security Accumulated Other Comprehensive Income (Loss) [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Estimated future contributions in remainder of fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Earnings Per Common Share: Earnings Per Share [Abstract] Natural Gas Storage Service Natural Gas, Storage [Member] Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Supply Corporation Supply Corporation [Member] Supply Corporation Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Impairment of Exploration and Production Properties Impairment Of Exploration and Production Properties [Member] Impairment Of Exploration and Production Properties Life Insurance Contracts Cash Surrender Value of Life Insurance Other Post-Retirement Liabilities Postemployment Benefits Liability, Noncurrent Award Timing Disclosures [Line Items] Service Cost Defined Benefit Plan, Service Cost Measurement Frequency [Domain] Measurement Frequency [Domain] Number of counterparties in which the company holds over-the-counter swap positions Number Of Counterparties In Which The Company Holds Over The Counter Swap Positions The number of counterparties in which the company holds over-the-counter swap positions. Non-Qualified Benefit Plan Liability Defined Benefit Plan, Benefit Obligation, Current Defined Benefit Plan, Benefit Obligation, Current Other Regulatory Assets Regulatory Asset, Noncurrent, Other Regulatory Asset, Noncurrent, Other Interest rate (in percent) Debt Instrument, Interest Rate During Period Net Income Available for Common Stock Net Income Available for Common Stock Net Income Available for Common Stock Segment Profit: Net Income (Loss) Net Income (Loss) Attributable to Parent Other Expense (Income) Items Other Expense (Income) Other Expense (Income) Corporate and Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Other Liabilities Liabilities, Noncurrent [Abstract] Other Liabilities Increase (Decrease) in Other Operating Liabilities Other Other Accrued Liabilities, Current Capitalization: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Allowance for Uncollectible Accounts [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Shares Repurchased Under Repurchase Plan Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Per share or per unit amount of equity securities issued (in dollars per share) Shares Issued, Price Per Share Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Regulatory Matters [Table] Regulatory Matters [Table] Regulatory Matters [Table] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating Income Operating Income (Loss) Stock-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Balance at Beginning of Period Balance at March 31 Earnings Reinvested in the Business Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Asset Retirement Obligations Asset Retirement Obligations, Noncurrent Amounts Payable to Customers Increase (Decrease) in Regulatory Clause Revenue Net Proceeds from Issuance of Long-Term Debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Gains and Losses on Derivative Financial Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Retirement Plan Type [Axis] Other Income Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Derivative liability Derivative Liability Production of Natural Gas Natural Gas, Production [Member] Deferred income tax benefit Deferred Income Tax Expense (Benefit) Regulatory Matters Regulatory Assets And Regulatory Liabilities [Text Block] Description containing the entire regulatory assets and liabilities disclosure as a single block of text. Detailed information about assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Detailed information about the liabilities that result from rate actions of a regulator. rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Reclassification out of Accumulated Other Comprehensive Income (Loss) [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] 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] Mutual Funds Equity Securities, FV-NI, Current Liability for Royalty and Working Interests Liability For Royalty And Working Interest Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for obligations incurred for oil and gas properties with joint interest partners. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted Average Common Shares Outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Alternative Revenue Programs Alternative Revenue Programs Adjustments to revenue from alternative revenue programs outside scope of authoritative guidance on revenue recognition designed to mitigate the impact of weather and conservation, to adjust billings for the effects of broad external factors and to compensate the Company for demand-side management initiatives. Amendment Flag Amendment Flag Other Post-Retirement Benefits Other Postretirement Benefits Plan [Member] Total Reportable Segments Total Reportable Segments [Member] Total Reportable Segments [Member] Other Commitments [Table] Other Commitments [Table] Termination Date Trading Arrangement Termination Date Net Cash Provided by (Used in) Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Used in Basic Calculation (shares) Weighted Average Number of Shares Outstanding, Basic Purchased Gas Cost of Product and Service Sold Public utilities authorized rate increase, amount Public Utilities Authorized Rate Increase Decrease Amount Public Utilities Authorized Rate Increase Decrease Amount Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Reserve for Gas Replacement Current Liabilities, Reserve for Gas Replacement Current Liabilities, Reserve for Gas Replacement Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Income (Expense): Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Net Accounts Receivable Written-Off Accounts Receivable, Allowance for Credit Loss, Writeoff Unrecovered Purchased Gas Costs Unrecovered Costs for Purchased Gas Amount Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued EARNINGS REINVESTED IN THE BUSINESS Supplemental Income Statement Elements [Abstract] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Regulatory Matters [Line Items] Regulatory Matters [Line Items] Regulatory Matters [Line Items] Senior Unsecured Bridge Loan Facility & Term Loan Facility Commitment Letter, Net Senior Unsecured Bridge Loan Facility & Term Loan Facility Commitment Letter, Net [Member] Senior Unsecured Bridge Loan Facility & Term Loan Facility Commitment Letter, Net Restricted Stock Units Non Performance Based Restricted Stock Units [Member] Non-performance Based Restricted Stock Units [Member] Equity Mutual Fund Equity Mutual Fund [Member] Equity Mutual Fund [Member] Dividends Payable Dividends Payable, Current Interest Expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount FERC estimated annual reduction of revenue amount FERC Estimated Annual Reduction of Revenue Amount FERC Estimated Annual Reduction of Revenue Amount Derivative Asset Netting Adjustment Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Insider Trading Arrangements [Line Items] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Public utilities distribution system improvement charge recovered from customers Public Utilities Distribution Corporation Recovered From Customers Public Utilities Distribution Corporation Recovered From Customers Other Product and Service, Other [Member] Total Other Liabilities Liabilities, Noncurrent Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Natural Gas Commercial Sales Natural Gas Commercial Sales [Member] Natural Gas Commercial Sales [Member] Vectren Energy Delivery of Ohio, LLC Vectren Energy Delivery of Ohio, LLC [Member] Vectren Energy Delivery of Ohio, LLC Non-Cash Capital Expenditures Capital Expenditures Incurred but Not yet Paid Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other Regulatory Liabilities Regulatory Liability, Noncurrent, Other Regulatory Liability, Noncurrent, Other Production of Crude Oil Production of Crude Oil [Member] Production of Crude Oil [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Share Repurchases (in shares) Share Repurchases (in shares) Stock Repurchased During Period, Shares Operating Revenues Operating Revenues [Member] Operating Revenues Integrated Upstream and Gathering Integrated Upstream and Gathering [Member] Integrated Upstream and Gathering Operating Expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Balanced Equity Mutual Fund Balanced Equity Mutual Fund [Member] Balanced Equity Mutual Fund [Member] Operation and Maintenance Utilities Operating Expense, Maintenance and Operations Common Stock Issued from Sale of Common Stock Stock Issued During Period, Value, New Issues Unrecovered Purchased Gas Costs Increase (Decrease) in Deferred Gas Cost Statement [Line Items] Statement [Line Items] Schedule of Common Stock Share Activity Schedule of Common Stock Share Activity [Table Text Block] Schedule of Common Stock Share Activity Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and Temporary Cash Investments Cash and Cash Equivalent Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Reserve For Gas Replacement Reserve For Gas Replacement [Member] Reserve For Gas Replacement In Utitlity Segment [Member] Environmental Site Remediation Costs Environmental Restoration Costs [Member] Common Stock Common Stock [Member] Interest Income Interest Income, Domestic Deposits Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Discounts on Purchased Receivables Accounts Receivable, Purchase