XML 94 R75.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes (Effective and Statutory Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Entity Information [Line Items]      
Statutory Federal tax rate 35.00% 35.00% 35.00%
State taxes, net of Federal tax benefit 0.40% 0.10% 0.10%
AFUDC - Equity (0.70%) (0.30%) 1.50%
Amortization of investment tax credits 0.30% 0.00% 0.20%
Section 199 - domestic production deduction 0.00% 0.60% 1.80%
Non-deductible goodwill impairment 0.00% 0.00% (48.00%)
Other, net (a) (13.90%) (0.30%) 0.80%
Effective tax rate 21.10% 35.10% (8.60%)
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 0.40% 0.30% 0.20%
AFUDC - Equity 1.40% 2.10% (1.70%)
Amortization of investment tax credits (0.40%) (0.30%) (0.20%)
Other, net (a) (1.30%) (5.10%) (2.10%)
Effective tax rate 35.10% 32.00% 31.20%