Cover Statement	6 Months Ended
	Jun. 30, 2025
Entity Information [Line Items]
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000787250
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	Jun. 30, 2025
Document Transition Report	false
Entity Registrant Name	DPL LLC
Entity Incorporation, State or Country Code	OH
Entity File Number	1-9052
Entity Address, Address Line One	1065 Woodman Drive
Entity Address, Postal Zip Code	45432
Local Phone Number	259-7215
Entity Tax Identification Number	31-1163136
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, City or Town	Dayton
Entity Address, City or Town	OH
City Area Code	937
Document Information [Line Items]
Entity Current Reporting Status	No