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Income Taxes (Effective and Statutory Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Entity Information [Line Items]      
Statutory Federal tax rate 35.00% 35.00% 35.00%
State taxes, net of Federal tax benefit 0.10% 1.10% (0.60%)
AFUDC - Equity 1.50% (4.70%) 1.50%
Amortization of investment tax credits 0.20% (0.70%) 0.20%
Section 199 - domestic production deduction 1.80% (1.60%) 2.00%
Non-deductible goodwill impairment (48.00%) 0.00% (52.10%)
Other, net 0.80% (7.90%) 4.30%
Effective tax rate (8.60%) 21.20% (9.70%)
THE DAYTON POWER AND LIGHT COMPANY [Member]      
Entity Information [Line Items]      
Statutory Federal tax rate 35.00% 35.00% 35.00%
State taxes, net of Federal tax benefit 0.30% 0.80% 0.30%
AFUDC - Equity (2.00%) (1.70%) (2.40%)
Amortization of investment tax credits (1.70%) (1.60%) (2.40%)
Section 199 - domestic production deduction (4.30%) (3.00%) (4.00%)
Other, net (2.50%) (3.80%) (8.30%)
Effective tax rate 24.80% 25.70% 18.20%