Retirement Benefits and Trusteed Assets (Details Textuals)	3 Months Ended
	Mar. 31, 2017 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by employer	$ 126,000,000
Maximum contribution amount	180,000,000
Pension Benefits | DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by employer	125,000,000
Maximum contribution amount	145,000,000
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum contribution amount	$ 0