0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Nature of Business link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Regulation link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Revenue and Accounts Receivable link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Shareholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Securitization link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Interim Pension and Other Postretirement Benefit Plan Information link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Financial Instruments link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Concentration of Credit Risk link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Regulation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Revenue and Accounts Receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Shareholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Securitization (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Interim Pension and Other Postretirement Benefit Plan Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Nature of Business (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Regulation (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Segment Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Segment Information - Schedule of Income Statements and Capital Expenditures By Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Segment Information - Schedule of Balance Sheet Information by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Revenue and Accounts Receivable - Schedule of Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Revenue and Accounts Receivable - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Debt - Schedule of Long-term Debt Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Debt - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Shareholders' Equity - Schedule of Reconciliation of Changes in Stockholders Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Shareholders' Equity - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Shareholders' Equity - Schedule of Forward Sales Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Securitization - Schedule of Condensed Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Securitization - Schedule of Consolidated Statements of Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Interim Pension and Other Postretirement Benefit Plan Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Financial Instruments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Financial Instruments - Schedule Of Expected Deferred Gains (Losses) Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink