v3.26.1
Cover Statement - shares
3 Months Ended
Mar. 31, 2026
May 05, 2026
Entity Information [Line Items]    
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0000027430  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Entity Current Reporting Status No  
Document Type 10-Q  
Document Quarterly Report true  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity Registrant Name THE DAYTON POWER AND LIGHT COMPANY  
Entity Incorporation, State or Country Code OH  
Entity File Number 1-2385  
Entity Address, Address Line One 1065 Woodman Drive  
Entity Address, Postal Zip Code 45432  
Local Phone Number 259-7215  
Entity Tax Identification Number 31-0258470  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   41,172,173
Entity Address, City or Town Dayton  
Entity Address, City or Town OH  
City Area Code 937