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Long-Term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Current maturities $ (1,100,000) $ (263,100,000)  
Long-term debt excluding current maturities 3,515,700,000 2,756,800,000  
Amortization of Financing Costs 5,700,000 5,500,000 8,100,000
Repayments of Long-term Debt 265,300,000 513,800,000 598,500,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,100,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two 15,100,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,100,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 382,100,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five 351,100,000    
Kansas City Power and Light Company [Member]
      
Debt Instrument [Line Items]      
Current maturities 0 (400,000)  
Unamortized discount (4,100,000) (4,000,000)  
Long-term debt excluding current maturities 2,312,200,000 1,901,700,000  
Amortization of Financing Costs 3,200,000 2,900,000 3,600,000
Repayments of Long-term Debt 2,600,000 12,700,000 263,100,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0    
Long-term Debt, Maturities, Repayments of Principal in Year Two 14,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 0    
Long-term Debt, Maturities, Repayments of Principal in Year Four 281,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five 350,000,000    
Kansas City Power and Light Company [Member] | Secured Debt [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 596,400,000 630,100,000  
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR due 2015-2035 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 146,400,000 106,900,000  
Debt Instrument Maturity Date Range Start Dec. 31, 2015    
Debt Instrument Maturity Date Range End Dec. 31, 2035    
Long-term Debt, Weighted Average Interest Rate 2.95% [1]    
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds Series 2009 due 2019 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 400,000,000 400,000,000  
Debt Instrument, Maturity Date Dec. 31, 2019    
Interest rates (in hundredths) 7.15%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 8.59% [2]    
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR series 2005 due 2035 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 50,000,000 50,000,000  
Debt Instrument, Maturity Date Dec. 31, 2035    
Interest rates (in hundredths) 4.65%    
Kansas City Power and Light Company [Member] | Secured Debt [Member] | General Mortgage bonds EIRR series 2007B due 2035 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 0 73,200,000  
Interest rates (in hundredths) 5.375%    
Kansas City Power and Light Company [Member] | Secured Debt [Member] | Secured EIRR Bonds Series 2005 [Member]
      
KCPL Municipal Bond Insurance Policies [Abstract]      
Principal outstanding covered by insurance policies 35,900,000    
Insurance Agreement Covenant Description The insurance agreements contain a covenant that the indebtedness to total capitalization ratio of KCP&L and its consolidated subsidiaries will not be greater than 0.68 to 1.00.    
Insurance Agreement Covenant Compliance in compliance    
Insurance Agreement Covenant Indebtedness To Total Capitalization Ratio Maximum 75.00%    
Proportion Of Secured Debt To Total Indebtedness Based On Bond Ratings Maximum In Hundredths 50.00%    
Aggregate Amount Of Outstanding General Mortgage Bonds As Percentage Of Total Capitalization Maximum In Hundredths 10.00%    
Kansas City Power and Light Company [Member] | Senior Notes [Member] | Senior notes due 2017 KCPL [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 250,000,000 250,000,000  
Debt Instrument, Maturity Date Dec. 31, 2017    
Interest rates (in hundredths) 5.85%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 5.72% [2]    
Kansas City Power and Light Company [Member] | Senior Notes [Member] | Senior notes due 2018 KCPL [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 350,000,000 350,000,000  
Debt Instrument, Maturity Date Dec. 31, 2018    
Interest rates (in hundredths) 6.375%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 7.49% [2]    
Kansas City Power and Light Company [Member] | Senior Notes [Member] | Senior Notes due 2023 KCPL [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 300,000,000 0  
Debt Instrument, Maturity Date Dec. 31, 2023    
Interest rates (in hundredths) 3.15%    
Kansas City Power and Light Company [Member] | Senior Notes [Member] | Senior notes due 2035 KCPL [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 250,000,000 250,000,000  
Debt Instrument, Maturity Date Dec. 31, 2035    
Interest rates (in hundredths) 6.05%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 5.78% [2]    
Kansas City Power and Light Company [Member] | Senior Notes [Member] | Senior Notes Due 2041 KCPL [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 400,000,000 400,000,000  
Debt Instrument, Maturity Date Dec. 31, 2041    
Interest rates (in hundredths) 5.30%    
Kansas City Power and Light Company [Member] | Unsecured Debt [Member] | EIRR Bonds Series 2007A and 2007B due 2035 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 146,500,000 0  
Debt Instrument, Maturity Date Dec. 31, 2035    
Variable rate (in hundredths) 0.07% [3]    
Kansas City Power and Light Company [Member] | Unsecured Debt [Member] | EIRR bonds 2.875 percent Series 2008 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 23,400,000 23,400,000  
Debt Instrument, Maturity Date Dec. 31, 2038    
Interest rates (in hundredths) 2.875%    
Kansas City Power and Light Company [Member] | Unsecured Debt [Member] | Unsecured EIRR Bonds Series 2005 [Member]
      
KCPL Municipal Bond Insurance Policies [Abstract]      
Principal outstanding covered by insurance policies 50,000,000    
Additional collateral necessary due to issuance of additional mortgage bonds 50,000,000    
Insurance Agreement Covenant Description The insurance agreements contain a covenant that the indebtedness to total capitalization ratio of KCP&L and its consolidated subsidiaries will not be greater than 0.68 to 1.00.    
Insurance Agreement Covenant Compliance in compliance    
Insurance Agreement Covenant Indebtedness To Total Capitalization Ratio Maximum 75.00%    
Proportion Of Secured Debt To Total Indebtedness Based On Bond Ratings Maximum In Hundredths 50.00%    
Aggregate Amount Of Outstanding General Mortgage Bonds As Percentage Of Total Capitalization Maximum In Hundredths 10.00%    
Kansas City Power and Light Company [Member] | Other Debt [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 0 2,600,000  
KCPL Greater Missouri Operations [Member] | Secured Debt [Member] | First Mortgage Bonds due through 2021 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 9,000,000 10,100,000  
Debt Instrument Maturity Date Range Start Dec. 31, 2014    
Debt Instrument Maturity Date Range End Dec. 31, 2021    
Interest rates (in hundredths) 9.44%    
KCPL Greater Missouri Operations [Member] | Senior Notes [Member] | Senior notes 8.27 percent series due 2021 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 80,900,000 80,900,000  
Debt Instrument, Maturity Date Dec. 31, 2021    
Interest rates (in hundredths) 8.27%    
KCPL Greater Missouri Operations [Member] | Senior Notes [Member] | Senior Notes Series A due 2025 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 125,000,000 0  
Debt Instrument, Maturity Date Dec. 31, 2025    
Interest rates (in hundredths) 3.49%    
GMO Senior Notes [Abstract]      
Debt Instrument, Covenant Description GMO is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the agreement, not greater than 0.65 to 1.00 at all times. In addition, GMO's priority debt, as defined in the agreement, cannot exceed 15% of consolidated tangible net worth, as defined in the agreement    
Debt Instrument, Covenant Compliance in compliance    
KCPL Greater Missouri Operations [Member] | Senior Notes [Member] | Senior Notes Series B due 2033 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 75,000,000 0  
Debt Instrument, Maturity Date Dec. 31, 2033    
Interest rates (in hundredths) 4.06%    
GMO Senior Notes [Abstract]      
Debt Instrument, Covenant Description GMO is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the agreement, not greater than 0.65 to 1.00 at all times. In addition, GMO's priority debt, as defined in the agreement, cannot exceed 15% of consolidated tangible net worth, as defined in the agreement.    
Debt Instrument, Covenant Compliance in compliance    
KCPL Greater Missouri Operations [Member] | Senior Notes [Member] | Senior Notes Series C due 2043 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 150,000,000 0  
Debt Instrument, Maturity Date Dec. 31, 2043    
Interest rates (in hundredths) 4.74%    
GMO Senior Notes [Abstract]      
Debt Instrument, Covenant Description GMO is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the agreement, not greater than 0.65 to 1.00 at all times. In addition, GMO's priority debt, as defined in the agreement, cannot exceed 15% of consolidated tangible net worth, as defined in the agreement.    
Debt Instrument, Covenant Compliance in compliance    
KCPL Greater Missouri Operations [Member] | Medium-term Notes [Member] | Medium term notes 7.16 percent series due 2013 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 0 6,000,000  
Interest rates (in hundredths) 7.16%    
Repayments of Long-term Debt 6,000,000    
KCPL Greater Missouri Operations [Member] | Medium-term Notes [Member] | Medium term notes 7.33 percent series due 2023 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 3,000,000 3,000,000  
Debt Instrument, Maturity Date Dec. 31, 2023    
Interest rates (in hundredths) 7.33%    
KCPL Greater Missouri Operations [Member] | Medium-term Notes [Member] | Medium term notes 7.17 percent series due 2023 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 7,000,000 7,000,000  
Debt Instrument, Maturity Date Dec. 31, 2023    
Interest rates (in hundredths) 7.17%    
KCPL Greater Missouri Operations [Member] | Unsecured Debt [Member] | Pollution control bonds Wamego Series 1996 due 2026 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 7,300,000 7,300,000  
Debt Instrument, Maturity Date Dec. 31, 2026    
Variable rate (in hundredths) 0.113% [3]    
KCPL Greater Missouri Operations [Member] | Unsecured Debt [Member] | Pollution control bonds state environmental 1993 due 2028 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 5,000,000 5,000,000  
Debt Instrument, Maturity Date Dec. 31, 2028    
Variable rate (in hundredths) 0.113% [3]    
KCPL Greater Missouri Operations [Member] | Unsecured Debt [Member] | Pollution control bonds SJLP due 2013 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 0 5,600,000  
Interest rates (in hundredths) 5.85%    
Repayments of Long-term Debt 5,600,000    
Parent Company [Member]
      
Debt Instrument [Line Items]      
Current maturities 0 (250,000,000)  
Long-term debt excluding current maturities 742,400,000 743,000,000  
Repayments of Long-term Debt 250,000,000 0 0
Parent Company [Member] | Senior Notes [Member] | Senior notes due 2013 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 0 250,000,000  
Interest rates (in hundredths) 2.75%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 3.67% [2]    
Repayments of Long-term Debt 250,000,000    
Parent Company [Member] | Senior Notes [Member] | Senior notes due 2017 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 100,000,000 100,000,000  
Debt Instrument, Maturity Date Dec. 31, 2017    
Interest rates (in hundredths) 6.875%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 7.33% [2]    
Parent Company [Member] | Senior Notes [Member] | Senior Notes Due 2021 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 350,000,000 350,000,000  
Debt Instrument, Maturity Date Dec. 31, 2021    
Interest rates (in hundredths) 4.85%    
Rate after amortizing gains or losses in Other Comprehensive Income (in hundredths) 7.34% [2]    
Parent Company [Member] | Senior Notes [Member] | Senior Notes Due 2022 [Member]
      
Debt Instrument [Line Items]      
Principal outstanding 287,500,000 287,500,000  
Debt Instrument, Maturity Date Dec. 31, 2022    
Interest rates (in hundredths) 5.292%    
Other Consolidated Entities [Member]
      
Debt Instrument [Line Items]      
Current maturities (1,100,000) (262,700,000)  
Unarmortized discount and premium, net 4,900,000 5,400,000  
Amortization of Financing Costs $ 2,500,000 $ 2,600,000 $ 4,500,000
[1] Weighted-average interest rates at December 31, 2013
[2] Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments
[3] Variable rate