Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Other income	$ 57	$ 49	$ 109	$ 100
Effective tax rate increase (decrease)	6.00%
Unrecognized tax benefits that would impact effective tax rate	$ 2		2
Unrecognized compensation cost	77		$ 77
Recognition period (in years)			1 year 6 months 21 days
Power and Industrial Projects
Significant Accounting Policies [Line Items]
Other income	20	20	$ 39	39
DTE Electric
Significant Accounting Policies [Line Items]
Other income	17	13	33	28
Unrecognized tax benefits that would impact effective tax rate	3		3
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	8		8		$ 6
Allocated costs	$ 9	$ 8	$ 19	$ 12