0001001 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - CONSOLIDATED STATEMENTS OF INCOME link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - CONSOLIDATED STATEMENTS OF CHANGE IN COMMON SHAREHOLDERS' EQUITY Statement link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOW link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - Summary of Significant Accounting Policies: (Policies) link:presentationLink link:calculationLink link:definitionLink 2403401 - Disclosure - Summary of Significant Accounting Policies: (Details) link:presentationLink link:calculationLink link:definitionLink 2104102 - Disclosure - Revenue from Contract with Customer link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Revenue from Contract with Customers (Tables) link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Revenue from Contract with Customers - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Revenue from Contract with Customers - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2408404 - Disclosure - Revenue from Contract with Customers - Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2109103 - Disclosure - Regulatory Matters link:presentationLink link:calculationLink link:definitionLink 2310302 - Disclosure - Regulatory Matters: (Tables) link:presentationLink link:calculationLink link:definitionLink 2411405 - 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Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2420410 - Disclosure - Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2121106 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 2322305 - Disclosure - Fair Value of Financial Instruments: (Tables) link:presentationLink link:calculationLink link:definitionLink 2423411 - Disclosure - Fair Value of Financial Instruments: (Details) link:presentationLink link:calculationLink link:definitionLink 2124107 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2425412 - Disclosure - Income Taxes: (Details) link:presentationLink link:calculationLink link:definitionLink 2126108 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 2327306 - Disclosure - Employee Benefit Plans: (Tables) link:presentationLink link:calculationLink link:definitionLink 2428413 - Disclosure - Employee Benefit Plans: (Details) link:presentationLink link:calculationLink link:definitionLink 2129109 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 2330307 - Disclosure - Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 2431414 - Disclosure - Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 2132110 - Disclosure - Business Segments link:presentationLink link:calculationLink link:definitionLink 2333308 - Disclosure - Business Segments: (Tables) link:presentationLink link:calculationLink link:definitionLink 2434415 - Disclosure - Business Segments: (Details) link:presentationLink link:calculationLink link:definitionLink 2435416 - Disclosure - Business Segments: (Details 2) link:presentationLink link:calculationLink link:definitionLink 2136111 - Disclosure - Completion of Electric Utility Reorganization Plan link:presentationLink link:calculationLink link:definitionLink 2337309 - Disclosure - Completion of Electric Utility Reorganization Plan (Tables) link:presentationLink link:calculationLink link:definitionLink 2438417 - Disclosure - Completion of Electric Utility Reorganization Plan (Details) link:presentationLink link:calculationLink link:definitionLink