2107100 - Disclosure - Asset Retirement Obligations
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2407402 - Disclosure - Asset Retirement Obligations (Details)
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2114100 - Disclosure - Commitments and Contingencies
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1001000 - Statement - Consolidated Balance Sheets
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1001501 - Statement - Consolidated Balance Sheets (Parenthetical)
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1003000 - Statement - Consolidated Statements of Cash Flows
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1003000 - Statement - Consolidated Statements of Cash Flows
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1004000 - Statement - Consolidated Statements of Changes in Equity
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1002000 - Statement - Consolidated Statements of Income and Comprehensive Income
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0001000 - Document - Document And Entity Information
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2109100 - Disclosure - Equity Compensation
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2409402 - Disclosure - Equity Compensation (Details)
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2309301 - Disclosure - Equity Compensation (Tables)
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2113100 - Disclosure - Fair Value Measurements
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2413402 - Disclosure - Fair Value Measurements - Debt (Details)
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2413405 - Disclosure - Fair Value Measurements - Gain (Loss) (Details)
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2413404 - Disclosure - Fair Value Measurements - NAV (Details)
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2413403 - Disclosure - Fair Value Measurements - Recurring (Details)
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2313301 - Disclosure - Fair Value Measurements (Tables)
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2115100 - Disclosure - Guarantees
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2415401 - Disclosure - Guarantees (Details)
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2419402 - Disclosure - Income Tax Expense (Details)
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2111100 - Disclosure - Long-Term Debt
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2411401 - Disclosure - Long-Term Debt Long-Term Debt - Narrative (Details)
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2103100 - Disclosure - Merger of Great Plains Energy and Westar Energy
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2403402 - Disclosure - Merger of Great Plains Energy and Westar Energy - Narrative (Details)
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2403404 - Disclosure - Merger of Great Plains Energy and Westar Energy - Purchase Price Allocation (Details)
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2403405 - Disclosure - Merger of Great Plains Energy and Westar Energy - Schedule Assets Acquired and Liabilities Assumed (Details)
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2403403 - Disclosure - Merger of Great Plains Energy and Westar Energy - Schedule of Pre-tax Costs and Deferrals (Details)
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2303301 - Disclosure - Merger of Great Plains Energy and Westar Energy (Tables)
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2403406 - Disclosure - Merger of Great Plains Energy and Westar Energy - Unaudited Pro Forma Financial Information (Details)
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2101100 - Disclosure - Organization and Basis of Presentation
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2401409 - Disclosure - Organization and Basis of Presentation - Antidilutive Securities (Details)
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2401408 - Disclosure - Organization and Basis of Presentation - Earnings Per Share (Details)
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2401405 - Disclosure - Organization and Basis of Presentation - Fuel Inventory and Supplies (Details)
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2401413 - Disclosure - Organization and Basis of Presentation - New Accounting Standards (Details)
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2401410 - Disclosure - Organization and Basis of Presentation Organization and Basis of Presentation - Dividends Declared (Details)
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2401403 - Disclosure - Organization and Basis of Presentation - Organization (Details)
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2201201 - Disclosure - Organization and Basis of Presentation (Policies)
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2401412 - Disclosure - Organization and Basis of Presentation - Schedule of Retrospective Adjustments (Details)
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2401406 - Disclosure - Organization and Basis of Presentation - Summary of Property, Plant and Equipment (Details)
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2401404 - Disclosure - Organization and Basis of Presentation - Summary of Reclassifications (Details)
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2401411 - Disclosure - Organization and Basis of Presentation - Supplemental Cash Flow Information (Details)
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2301302 - Disclosure - Organization and Basis of Presentation (Tables)
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2108100 - Disclosure - Pension Plans and Other Employee Benefits
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2408402 - Disclosure - Pension Plans and Other Employee Benefits (Details)
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2308301 - Disclosure - Pension Plans and Other Employee Benefits (Tables)
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2106100 - Disclosure - Rate Matters and Regulation
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2406401 - Disclosure - Rate Matters and Regulation (Details)
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2105100 - Disclosure - Receivables
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2405402 - Disclosure - Receivables (Details)
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2405403 - Disclosure - Receivables - Narrative (Details)
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2405404 - Disclosure - Receivables - Summary of Bad Debt Expense (Details)
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2116100 - Disclosure - Related Party Transactions and Relationships
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2416402 - Disclosure - Related Party Transactions and Relationships (Details)
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2316301 - Disclosure - Related Party Transactions and Relationships (Tables)
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2104100 - Disclosure - Revenue
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2404402 - Disclosure - Revenue (Details)
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2304301 - Disclosure - Revenue (Tables)
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2117100 - Disclosure - Shareholders' Equity
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2417401 - Disclosure - Shareholders' Equity (Details)
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2110100 - Disclosure - Short-term Borrowings and Short-term Bank Lines of Credit
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2410402 - Disclosure - Short-term Borrowings and Short-term Bank Lines of Credit (Details)
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2310301 - Disclosure - Short-term Borrowings and Short-term Bank Lines of Credit (Tables)
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2119100 - Disclosure - Taxes
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2319301 - Disclosure - Taxes (Tables)
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2419409 - Disclosure - Taxes Tax Reform (Details)
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2118100 - Disclosure - Variable Interest Entities
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2418402 - Disclosure - Variable Interest Entities (Details)
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2318301 - Disclosure - Variable Interest Entities (Tables)
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