0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - STATEMENTS OF CHANGES IN COMMON SHAREHOLDER'S EQUITY link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOW link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Revenues link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Regulatory Matters link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Earnings per Share/Capital Stock link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Derivative Instruments link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Business Segments link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenues (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Earnings per Share/Capital Stock (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Fair Value of Financial Instruments: (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Employee Benefit Plans: (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Business Segments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Summary of Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Revenues - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Revenues - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Revenues - Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Regulatory Matters - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Earnings per Share/Capital Stock - Schedule of EPS (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Earnings per Share/Capital Stock - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Derivative Instruments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Derivative Instruments - Schedule of Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Fair Value of Financial Instruments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Fair Value of Financial Instruments - Schedule of Outstanding Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Income Taxes: (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Employee Benefit Plans - Schedule of Net Periodic Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Employee Benefit Plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Business Segments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Business Segments - Schedule of Business Segments (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Business Segments - Schedule of PPE and Assets (Details) link:presentationLink link:calculationLink link:definitionLink