Property, Plant, and Equipment (Summary of Property by Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 31,424	$ 30,029
Accumulated depreciation and amortization	(10,703)	(10,299)
Net property, plant, and equipment	20,721	19,730
Non-utility and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,278	3,125
Accumulated depreciation and amortization	(938)	(858)
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	22,972	22,094
Accumulated depreciation and amortization	(7,984)	(7,721)
Net property, plant, and equipment	14,988	14,373
DTE Electric | Generation
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	12,166	11,990
Accumulated depreciation and amortization	(4,403)	(4,364)
DTE Electric | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	8,637	8,134
Accumulated depreciation and amortization	(2,914)	(2,769)
DTE Electric | Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,169	1,970
Accumulated depreciation and amortization	(667)	(588)
DTE Gas
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	5,174	4,810
Accumulated depreciation and amortization	(1,781)	(1,720)
DTE Gas | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,523	3,382
Accumulated depreciation and amortization	(1,238)	(1,198)
DTE Gas | Storage
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	533	503
Accumulated depreciation and amortization	(159)	(152)
DTE Gas | Transmission and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,118	925
Accumulated depreciation and amortization	$ (384)	$ (370)