Retirement Benefits and Trusteed Assets (Details Textuals) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum contribution amount	$ 175
Pension Benefits | DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum contribution amount	145
Qualified Pension Plan | DTE Gas
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum contribution amount	$ 20