Retirement Benefits and Trusteed Assets (Details Textuals)	6 Months Ended
	Jun. 30, 2015 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by Employer	$ 100,000,000
Estimated Future Employer Contributions in Current Fiscal Year	75,000,000
Pension Benefits | DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Estimated Future Employer Contributions in Current Fiscal Year	45,000,000
VEBA Trust | Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by Employer	24,000,000
Maximum | Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Estimated Future Employer Contributions in Current Fiscal Year	60,000,000
Maximum | Other Postretirement Benefits | DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Estimated Future Employer Contributions in Current Fiscal Year	$ 60,000,000