Property, Plant, and Equipment (Summary of Property by Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 31,810	$ 31,424
Accumulated depreciation and amortization	(10,160)	(10,703)
Net property, plant, and equipment	21,650	20,721
Non-utility and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,488	3,278
Accumulated depreciation and amortization	(998)	(938)
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	22,747	22,972
Accumulated depreciation and amortization	(7,310)	(7,984)
Net property, plant, and equipment	15,437	14,988
DTE Electric | Generation
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	11,027	12,166
Accumulated depreciation and amortization	(3,609)	(4,403)
DTE Electric | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	9,153	8,637
Accumulated depreciation and amortization	(2,974)	(2,914)
DTE Electric | Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,567	2,169
Accumulated depreciation and amortization	(727)	(667)
DTE Gas
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	5,575	5,174
Accumulated depreciation and amortization	(1,852)	(1,781)
DTE Gas | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,823	3,523
Accumulated depreciation and amortization	(1,283)	(1,238)
DTE Gas | Storage
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	548	533
Accumulated depreciation and amortization	(165)	(159)
DTE Gas | Transmission and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,204	1,118
Accumulated depreciation and amortization	$ (404)	$ (384)