0000001 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Statements of Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Calculation of Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Acquisitions and Divestitures (Notes) link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Revenue Recognition (Notes) link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Rates and Other Regulatory Activities link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Environmental Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Other Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Share-Based Compensation link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Derivative Instruments link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Long-Term Debt link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Short-Term Borrowings (Notes) link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Leases Leases link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Calculation of Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Revenue Recognition (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Rates and Other Regulatory Activities Rates and Regulatory Activities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Environmental Commitments and Contingencies Summary of Environmental Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Share-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Derivative Instruments Volume of Derivative Activity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Long-Term Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Short-Term Borrowings (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Leases Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Acquisitions and Divestitures (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Revenue Recognition Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Revenue Recognition Disegragation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Revenue Recognition Contract Balances with Customers (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Revenue Recognition Remaining Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Revenue Recognition Remaining Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Rates and Other Regulatory Activities - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Environmental Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Other Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Segment Information - Schedule of Segment Reporting Information by Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Employee Benefit Plans (Detail) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Employee Benefit Plans - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Employee Benefit Plans - Amounts Included in Regulatory Asset and Accumulated Other Comprehensive Income/Loss Recognized as Net Periodic Benefit Cost (Detail) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Share-Based Compensation - Share-Based Compensation Amounts Included in Net Income (Detail) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Share-Based Compensation - Summary of Stock Activity under the SICP (Detail) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Share-Based Compensation - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Share-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Derivative Instruments Volume of Derivative Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Derivative Instruments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Derivative Instruments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Derivative Instruments - Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet (Detail) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Derivative Instruments - Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet (Detail) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Derivative Instruments - Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements (Detail) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Derivative Instruments - Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements (Detail) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Fair Value of Financial Instruments - Summary of Changes in Fair Value of Investments (Detail) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Fair Value of Financial Instruments - Summary of Changes in Fair Value of Investments (Detail) link:presentationLink link:calculationLink link:definitionLink 9955551 - 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Disclosure - Leases Leases - Weighted Average Remaining Lease Term Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Leases Leases - Cash Flow Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Leases Leases - Schedule of Future Maturities Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink