2109100 - Disclosure - Acquisitions
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2409404 - Disclosure - Acquisitions - Narrative (Details)
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2409402 - Disclosure - Acquisitions - Schedule of Acquisitions (Details)
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2409403 - Disclosure - Acquisitions - Schedule of Construction Projects (Details)
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2309301 - Disclosure - Acquisitions (Tables)
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1004000 - Statement - Condensed Consolidated Balance Sheets (Unaudited)
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1004501 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)
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1003000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)
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1003501 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)
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1002000 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)
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1002501 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical)
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1001000 - Statement - Condensed Consolidated Statements of Income (Unaudited)
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2102100 - Disclosure - Contingencies and Regulatory Matters
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2402404 - Disclosure - Contingencies and Regulatory Matters - Current And Actual Cost Estimate (Details)
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2402405 - Disclosure - Contingencies and Regulatory Matters - Narrative (Details)
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2402402 - Disclosure - Contingencies and Regulatory Matters - Recovery Balance of Each Regulatory Clause - Alabama Power (Details)
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2402403 - Disclosure - Contingencies and Regulatory Matters - Recovery Balance of Each Regulatory Clause - Gulf Power (Details)
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2302301 - Disclosure - Contingencies and Regulatory Matters (Tables)
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2108100 - Disclosure - Derivatives
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2408404 - Disclosure - Derivatives - Balance Sheet Offsetting (Details)
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2408403 - Disclosure - Derivatives - Balance Sheet Presentation (Details)
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2408407 - Disclosure - Derivatives - Narrative (Details)
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2408405 - Disclosure - Derivatives - Pre-tax Effects of Derivatives Designated as Cash Flow Hedging Instruments (Details)
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2408406 - Disclosure - Derivatives - Pre-tax Effects of Derivatives Designated as Fair Value Hedging Instruments (Details)
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2408402 - Disclosure - Derivatives - Schedule of Derivatives and Gains (Losses) (Details)
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2308301 - Disclosure - Derivatives (Tables)
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0001000 - Document - Document and Entity Information
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2103100 - Disclosure - Fair Value Measurements
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2403402 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
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2403403 - Disclosure - Fair Value Measurements - Fair Value Measurements Calculated at Net Asset Value Per Share (Details)
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2403404 - Disclosure - Fair Value Measurements - Financial Instruments for which Carrying Amount did not Equal Fair Value (Details)
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2403405 - Disclosure - Fair Value Measurements - Narrative (Details)
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2303301 - Disclosure - Fair Value Measurements (Tables)
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2105100 - Disclosure - Financing
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2405404 - Disclosure - Financing - Narrative (Details)
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2405402 - Disclosure - Financing - Schedule of Credit Arrangements (Details)
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2405403 - Disclosure - Financing - Schedule of Long-Term Debt Financing Activities (Details)
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2305301 - Disclosure - Financing (Tables)
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2107100 - Disclosure - Income Taxes
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2407402 - Disclosure - Income Taxes (Details)
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2307301 - Disclosure - Income Taxes (Tables)
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2101100 - Disclosure - Introduction
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2401404 - Disclosure - Introduction - Asset Retirement Obligations (Details)
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2401403 - Disclosure - Introduction - Narrative (Details)
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2201201 - Disclosure - Introduction (Policies)
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2301302 - Disclosure - Introduction (Tables)
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2106100 - Disclosure - Retirement Benefits
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2406402 - Disclosure - Retirement Benefits (Details)
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2306301 - Disclosure - Retirement Benefits (Tables)
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2113100 - Disclosure - Segment and Related Information
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2413402 - Disclosure - Segment and Related Information - Financial Data for Business Segments (Details)
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2413403 - Disclosure - Segment and Related Information - Financial Data for Products and Services (Details)
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2313301 - Disclosure - Segment and Related Information (Tables)
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2104100 - Disclosure - Stockholders' Equity
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2404403 - Disclosure - Stockholders' Equity - Changes in Stockholders' Equity (Details)
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2404402 - Disclosure - Stockholders' Equity - Earnings per Share (Details)
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2304301 - Disclosure - Stockholders' Equity (Tables)
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