Entity Central Index Key Rabbi trust investments. Deposit assets fair value. Other investments fair value disclosure. Document document and entity information abstract. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Long-term debt includes redeemable preferred stock at redemption value. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Property, plant and equipment Property Plant And Equipment Gross Accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property, plant and equipment, net Property Plant And Equipment Net Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted funds Restricted Cash And Cash Equivalents At Carrying Value Accounts receivable, net Accounts Receivable Net Current Unbilled revenues Unbilled Receivables Current Materials and supplies Inventory Raw Materials And Supplies Other Other Assets Current Total current assets Assets Current Regulatory and other long-term assets: Regulated Entity Other Assets Noncurrent [Abstract] Regulatory assets Regulatory Assets Noncurrent Goodwill Goodwill Other Other Assets Noncurrent Total regulatory and other long-term assets Regulated Entity Other Assets Noncurrent TOTAL ASSETS Assets CAPITALIZATION AND LIABILITIES Liabilities And Stockholders Equity [Abstract] Capitalization: Capitalization Longterm Debt And Equity [Abstract] Common stock ($0.01 par value, 500,000,000 shares authorized, 181,720,136 and 180,907,483 shares issued, respectively) Common Stock Value Paid-in-capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Treasury stock, at cost (3,721,496 and 2,625,112 shares, respectively) Treasury Stock Value Total common stockholders' equity Stockholders Equity Long-term debt Long Term Debt And Capital Lease Obligations Redeemable preferred stock at redemption value Preferred Stock Redemption Amount Total long-term debt Long Term Debt Includes Redeemable Preferred Stock At Redemption Value Total capitalization Capitalization Longterm Debt And Equity Current liabilities: Liabilities Current [Abstract] Short-term debt Short Term Borrowings Current portion of long-term debt Long Term Debt And Capital Lease Obligations Current Accounts payable Accounts Payable Current Accrued liabilities Accrued Liabilities Current Taxes accrued Taxes Payable Current Interest accrued Interest Payable Current Other Other Liabilities Current Total current liabilities Liabilities Current Regulatory and other long-term liabilities: Liabilities Other Than Long Term Debt Noncurrent [Abstract] Advances for construction Customer Advances For Construction Deferred income taxes, net Deferred Tax Liabilities Noncurrent Deferred investment tax credits Accumulated Deferred Investment Tax Credit Regulatory liabilities Regulatory Liability Noncurrent Accrued pension expense Defined Benefit Pension Plan Liabilities Noncurrent Accrued postretirement benefit expense Other Postretirement Defined Benefit Plan Liabilities Noncurrent Other Other Liabilities Noncurrent Total regulatory and other long-term liabilities Liabilities Other Than Longterm Debt Noncurrent Contributions in aid of construction Contributions In Aid Of Construction Commitments and contingencies (see Note 9) Commitments And Contingencies TOTAL CAPITALIZATION AND LIABILITIES Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Treasury Stock, shares Treasury Stock Shares Income Statement [Abstract] Operating revenues Regulated And Unregulated Operating Revenue Operating expenses: Operating Expenses [Abstract] Operation and maintenance Utilities Operating Expense Maintenance And Operations Depreciation and amortization Utilities Operating Expense Depreciation And Amortization General taxes Utilities Operating Expense Taxes Gain on asset dispositions and purchases Gain Loss On Disposition Of Assets1 Total operating expenses, net Operating Expenses Operating income Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Interest, net Interest Income Expense Nonoperating Net Other, net Other Nonoperating Income Expense Total other income (expense) Nonoperating Income Expense Income from continuing operations before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income attributable to common stockholders Net Income Loss Basic earnings per share: Earnings Per Share Basic [Abstract] Net income attributable to common stockholders Earnings Per Share Basic Diluted earnings per share: Earnings Per Share Diluted [Abstract] Net income attributable to common stockholders Earnings Per Share Diluted Weighted-average common shares outstanding: Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Dividends declared per common share Common Stock Dividends Per Share Declared Statement Of Income And Comprehensive Income [Abstract] Net income attributable to common stockholders Other comprehensive income (loss), net of tax: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Pension amortized to periodic benefit cost: Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract] Actuarial loss, net of tax of $1 for the three months and $3 for the nine months Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax Foreign currency translation adjustment Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Unrealized loss on cash flow hedges, net of tax of $(3) and $0 for the three months and $(10) and $0 for the nine months Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Net other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Comprehensive income attributable to common stockholders Comprehensive Income Net Of Tax Actuarial loss, tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax Unrealized loss on cash flow hedge, tax Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax Cash flow non cash investing disclosure abstract.. Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Net income Profit Loss Adjustments to reconcile to net cash flows provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Deferred income taxes and amortization of investment tax credits Deferred Income Taxes And Tax Credits Provision for losses on accounts receivable Provision For Doubtful Accounts Pension and non-pension postretirement benefits Pension And Other Postretirement Benefit Expense Other non-cash, net Other Noncash Income Expense Changes in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Receivables and unbilled revenues Increase Decrease In Receivables Pension and non-pension postretirement benefit contributions Pension And Other Postretirement Benefit Contributions Accounts payable and accrued liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Other assets and liabilities, net Increase Decrease In Other Operating Capital Net Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Capital expenditures Payments To Acquire Property Plant And Equipment Acquisitions Payments To Acquire Businesses Net Of Cash Acquired Proceeds from sale of assets and securities Proceeds From Sale Of Productive Assets Removal costs from property, plant and equipment retirements, net Payments For Proceeds From Removal Costs Net funds restricted Increase Decrease In Restricted Cash Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from long-term debt Proceeds From Issuance Of Long Term Debt Repayments of long-term debt Repayments Of Long Term Debt Proceeds from short-term borrowings with maturities greater than three months Proceeds From Short Term Debt Maturing In More Than Three Months Repayments of short-term borrowings with maturities greater than three months Repayments Of Short Term Debt Maturing In More Than Three Months Net short-term borrowings with maturities less than three months Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less Proceeds from issuances of employee stock plans and DRIP Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Advances and contributions for construction, net of refunds of $17 and $17, respectively Proceeds From Construction Loans Payable Debt issuance costs Payments Of Debt Issuance Costs Dividends paid Payments Of Dividends Common Stock Anti-dilutive stock repurchase Payments For Repurchase Of Common Stock Tax benefit realized from equity compensation Excess Tax Benefit From Share Based Compensation Financing Activities Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents as of beginning of period Cash and cash equivalents as of end of period Non-cash investing activity: Cash Flow Non Cash Investing Disclosure [Abstract] Capital expenditures acquired on account but unpaid as of end of period Capital Expenditures Incurred But Not Yet Paid Advances and contributions for construction, net of refunds Repayments Of Construction Loans Payable Cumulative effect of change in accounting principle. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Paid-in Capital Additional Paid In Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Treasury Stock Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Beginning Balance (in shares) Shares Outstanding Cumulative effect of change in accounting principle Cumulative Effect Of Change In Accounting Principle Direct stock reinvestment and purchase plan Stock Issued During Period Value Dividend Reinvestment Plan Direct stock reinvestment and purchase plan (in shares) Stock Issued During Period Shares Dividend Reinvestment Plan Employee stock purchase plan Stock Issued During Period Value Employee Stock Purchase Plan Employee stock purchase plan (in shares) Stock Issued During Period Shares Employee Stock Purchase Plans Stock-based compensation activity Stock Issued During Period Value Share Based Compensation Stock-based compensation activity (in shares) Stock Issued During Period Shares Share Based Compensation Repurchases of common stock Treasury Stock Value Acquired Cost Method Repurchase of common stock (in shares) Treasury Stock Shares Acquired Net other comprehensive income (loss) Dividends Dividends Cash Ending Balance Ending Balance (in shares) Organization Consolidation And Presentation Of Financial Statements [Abstract] Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] New Accounting Pronouncements And Changes In Accounting Principles [Abstract] New Accounting Pronouncements New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Business Combinations [Abstract] Acquisitions Mergers Acquisitions And Dispositions Disclosures [Text Block] Equity [Abstract] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long Term Debt [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Pension and Other Postretirement Benefits Pension And Other Postretirement Benefits Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] New Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Award Type Award Type [Axis] Equity Award Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock Options Employee Stock Option [Member]