Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Common Stock, Shares Authorized	1,500	1,500	1,500
Common stock, shares issued	1	1
Common stock, par value (in USD per share)		$ 0.01
THE DAYTON POWER AND LIGHT COMPANY [Member]
Common Stock, Shares Authorized	50,000,000	50,000,000	50,000,000
Common Stock, Shares, Outstanding		41,172,173
Common stock, par value (in USD per share)	$ 0.01		$ 0.01