Property, Plant, and Equipment (Summary of Property by Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 35,072	$ 31,810
Accumulated depreciation and amortization	(9,755)	(10,160)
Net property, plant, and equipment	25,317	21,650
Gas Storage and Pipelines
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,524	2,307
Accumulated depreciation and amortization	(459)	(390)
Power and Industrial Projects
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,108	1,070
Accumulated depreciation and amortization	(604)	(546)
Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	183	111
Accumulated depreciation and amortization	(71)	(62)
Non-utility and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	4,815	3,488
Accumulated depreciation and amortization	(1,134)	(998)
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	24,279	22,747
Accumulated depreciation and amortization	(6,706)	(7,310)
Net property, plant, and equipment	17,573	15,437
DTE Electric | Generation
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	12,028	11,027
Accumulated depreciation and amortization	(3,460)	(3,609)
DTE Electric | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	9,715	9,153
Accumulated depreciation and amortization	(2,553)	(2,974)
DTE Electric | Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,536	2,567
Accumulated depreciation and amortization	(693)	(727)
DTE Gas
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	5,978	5,575
Accumulated depreciation and amortization	(1,915)	(1,852)
DTE Gas | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	4,164	3,823
Accumulated depreciation and amortization	(1,334)	(1,283)
DTE Gas | Storage
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	570	548
Accumulated depreciation and amortization	(172)	(165)
DTE Gas | Transmission and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,244	1,204
Accumulated depreciation and amortization	$ (409)	$ (404)