Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Other income	$ 51	$ 55	$ 160	$ 155
Effective tax rate increase (decrease)	(3.00%)		(3.00%)
Unrecognized tax benefits that would impact effective tax rate	$ 2		$ 2
Unrecognized compensation cost	64		$ 64
Recognition period (in years)			1 year 3 months 21 days
Power and Industrial Projects
Significant Accounting Policies [Line Items]
Other income	20	24	$ 59	64
DTE Electric
Significant Accounting Policies [Line Items]
Other income	15	14	48	42
Unrecognized tax benefits that would impact effective tax rate	3		3
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	6		6		$ 6
Allocated costs	$ 7	$ 7	$ 26	$ 20