Regulatory Matters (Details Textuals) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended					60 Months Ended	84 Months Ended
	Jun. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Dec. 31, 2012 mills_per_kWh	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Jun. 28, 2018	Jun. 28, 2020
Regulatory Asset and Liability [Line Items]
EO Reconciliation of net over-recovery					$ 26,000,000
REP Surcharge Revenue Recovery		15,000,000	100,000,000
REP Time Period				20 years
Transition PLD customers to DTE Electric distribution system										5 years	7 years
PSCR Reconcilaiton Calculating net Under Recovery						158,000,000	52,600,000
Pension Equalization Mechanism surcharge length	1 month
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
Levelized PSCR Factor					4.18
Power Supply Expense Forecast					$ 1,400,000,000