Benefit Plans (Weighted Average Assumptions Used to Determine Benefit Obligations) (Details) - Pension [Member]	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Discount rate for obligations	5.14%	5.41%	2.83%
Rate of compensation increases	3.21%	3.21%	3.21%
THE DAYTON POWER AND LIGHT COMPANY [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for obligations	5.14%	5.41%	2.83%
Rate of compensation increases	3.21%	3.21%	3.21%