Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)		3 Months Ended
	Mar. 07, 2018	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Maximum contribution amount		$ 25,000,000
Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Pension cost	$ 175,000,000	30,000,000	$ 35,000,000
Maximum contribution amount		0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Maximum contribution amount		$ 0
Qualified Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			126,000,000
Qualified Plan | Pension Benefits | DTE Electric
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 125,000,000