Property, Plant, and Equipment (Summary of Property by Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 28,121	$ 26,538
Less accumulated depreciation and amortization	(10,087)	(9,718)
Net Property, plant, and equipment	18,034	16,820
Non-utility and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,263	2,476
Less accumulated depreciation and amortization	(761)	(867)
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	21,391	19,805
Less accumulated depreciation and amortization	(7,646)	(7,216)
Net Property, plant, and equipment	13,745	12,589
DTE Electric | Generation
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	11,767	10,712
Less accumulated depreciation and amortization	(4,346)	(3,863)
DTE Electric | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	7,816	7,414
Less accumulated depreciation and amortization	(2,707)	(2,822)
DTE Electric | Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,808	1,679
Less accumulated depreciation and amortization	(593)	(531)
DTE Gas
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	4,467	4,257
Less accumulated depreciation and amortization	(1,680)	(1,635)
DTE Gas | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,124	2,946
Less accumulated depreciation and amortization	(1,163)	(1,130)
DTE Gas | Storage
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	453	448
Less accumulated depreciation and amortization	(147)	(142)
DTE Gas | Transmission and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	890	863
Less accumulated depreciation and amortization	$ (370)	$ (363)