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Risk & Uncertainties (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2020
Unusual Risk or Uncertainty [Line Items]      
Unusual Risks and Uncertainties    
As the economic impact of the COVID-19 pandemic started to materialize in Ohio in the second half of March and continued in the second and third quarters of 2020, the COVID-19 pandemic primarily impacted our retail sales demand as shown by the changes in weather-normalized volumes of kWh sold:

Customer classFor the three months ended September 30, 2020 compared to the same period in 2019
For the six months ended September 30, 2020 compared to the same period in 2019 (a)
For the nine months ended September 30, 2020 compared to the same period in 2019
Commercial(4.8)%(9.4)%(7.0)%
Industrial0.9%(9.3)%(6.8)%
Residential11.0%9.8%6.0%
(a) This period most closely approximates the duration of the economic impact on our sales demand as a result of the COVID-19 pandemic.
Residential [Member]      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 11.00% 9.80% 6.00%
Commercial      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (4.80%) (9.40%) (7.00%)
Industrial      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 0.90% (9.30%) (6.80%)
Subsidiaries [Member]      
Unusual Risk or Uncertainty [Line Items]      
Unusual Risks and Uncertainties    
COVID-19 Pandemic

The COVID-19 pandemic has severely impacted global economic activity, including electricity and energy consumption, and caused significant volatility and negative pressure in financial markets. The global impact of the outbreak has been rapidly evolving and many countries, including the United States, have reacted by instituting quarantines, mandating business and school closures and social distancing measures as well as restricting travel. The State of Ohio has implemented, among other things, stay-at-home and other social distancing measures to slow the spread of the virus, which has impacted energy demand within our service territory, though the stay-at-home restrictions have now been lifted in our service territory. On March 12, 2020, the PUCO also issued an emergency order prohibiting electric utilities, including us, from discontinuing electric utility service to customers. This prohibition ended for DP&L on September 1, 2020. We are taking a variety of measures in response to the spread of COVID-19 to ensure our ability to transmit, distribute and sell electric energy, ensure the health and safety of our employees, contractors, customers and communities and provide essential services to the communities in which we operate. In addition to the impacts to demand within our service territory, we also have incurred and expect to continue to incur expenses relating to COVID-19, and such expenses may include those that relate to events outside of our control.

As the economic impact of the COVID-19 pandemic started to materialize in Ohio in the second half of March and continued in the second and third quarters of 2020, the COVID-19 pandemic primarily impacted our retail sales demand as shown by the changes in weather-normalized volumes of kWh sold:
Customer classFor the three months ended September 30, 2020 compared to the same period in 2019
For the six months ended September 30, 2020 compared to the same period in 2019 (a)
For the nine months ended September 30, 2020 compared to the same period in 2019
Commercial(4.8)%(9.4)%(7.0)%
Industrial0.9%(9.3)%(6.8)%
Residential11.0%9.8%6.0%
(a) This period most closely approximates the duration of the economic impact on our sales demand as a result of the COVID-19 pandemic.
Subsidiaries [Member] | Residential [Member]      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 11.00% 9.80% 6.00%
Subsidiaries [Member] | Commercial      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (4.80%) (9.40%) (7.00%)
Subsidiaries [Member] | Industrial      
Unusual Risk or Uncertainty [Line Items]      
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 0.90% (9.30%) (6.80%)