Regulatory Matters (Details Textuals) (USD $)	1 Months Ended	60 Months Ended	84 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended					4 Months Ended	12 Months Ended
	Jun. 29, 2013	Jun. 28, 2018	Jun. 28, 2020	Jun. 30, 2013 Electric [Member]	Mar. 31, 2013 Electric [Member]	Jun. 30, 2013 Electric [Member]	Dec. 31, 2012 Electric [Member] mills_per_kWh	Dec. 31, 2011 Electric [Member]	Dec. 31, 2010 Electric [Member]	Dec. 31, 2009 Electric [Member]	Dec. 31, 2008 Electric [Member]	Oct. 31, 2012 Gas [Member]	Dec. 31, 2012 Gas [Member]	Jun. 30, 2013 Gas [Member]	Mar. 31, 2013 Gas [Member]	Jun. 30, 2013 Gas [Member]	Dec. 31, 2012 Gas [Member]
Regulatory Asset and Liability [Line Items]
Accrual for Environmental Loss Contingencies, Gross																$ 30,000,000	$ 29,000,000
EO Reconciliation net over-recovery							26,000,000						7,000,000
REP Surcharge Revenue Recover				15,000,000	100,000,000
REP Time Period						20 years
Years to transition PLD customers to DTE Electric distribution system		5 years	7 years
PSCR Reconciliation Calculating net Under Recovery								158,000,000	52,600,000
Pension Equalization Mechanism Reconciliation surcharge length	1 month
Levelized PSCR Factor							4.18
PSCR Over-recovery										15,600,000
Under-recovery of Pension Equalization Mechanism Reconciliation											7,100,000
Refund of Self-implemented Rate Increase								3,800,000
Power Supply Expense Forecast							1,400,000,000
RDM Application Proposed Recovery												$ 5,200,000
Composite Depreciation Rates														2.51%	2.29%