Retirement Benefits and Trusteed Assets (Details Textuals)	9 Months Ended
	Sep. 30, 2017 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by employer	$ 220,000,000
Maximum contribution amount	88,000,000
Pension Benefits | DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by employer	185,000,000
Maximum contribution amount	85,000,000
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum contribution amount	$ 0