Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Other income	$ 52	$ 51
Effective tax rate increase (decrease)	(5.00%)
Unrecognized tax benefits that would impact effective tax rate	$ 2
Unrecognized compensation cost	$ 82
Recognition period (in years)	1 year 9 months 15 days
Power and Industrial Projects
Significant Accounting Policies [Line Items]
Other income	$ 19	19
DTE Electric
Significant Accounting Policies [Line Items]
Other income	16	15
Unrecognized tax benefits that would impact effective tax rate	3
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	6		$ 6
Allocated Share-based Compensation Expense	$ 10	$ 4