Property, Plant, and Equipment (Summary of Property by Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 37,997	$ 35,072
Accumulated depreciation and amortization	(10,028)	(9,755)
Net property, plant, and equipment	27,969	25,317
Gas Storage and Pipelines
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,981	3,524
Accumulated depreciation and amortization	(511)	(459)
Power and Industrial Projects
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,194	1,108
Accumulated depreciation and amortization	(619)	(604)
Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	217	183
Accumulated depreciation and amortization	(84)	(71)
Non-utility and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	5,392	4,815
Accumulated depreciation and amortization	(1,214)	(1,134)
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	26,171	24,279
Accumulated depreciation and amortization	(7,050)	(6,706)
Net property, plant, and equipment	19,121	17,573
DTE Electric | Nuclear
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	3,295	3,022
Accumulated depreciation and amortization	(373)	(344)
DTE Electric | Renewables
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,817	1,362
Accumulated depreciation and amortization	(295)	(243)
DTE Electric | Fossil and other generation
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	8,031	7,644
Accumulated depreciation and amortization	(3,014)	(2,873)
DTE Electric | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	10,354	9,715
Accumulated depreciation and amortization	(2,686)	(2,553)
DTE Electric | Other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	2,674	2,536
Accumulated depreciation and amortization	(682)	(693)
DTE Gas
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	6,434	5,978
Accumulated depreciation and amortization	(1,764)	(1,915)
DTE Gas | Distribution
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	4,517	4,164
Accumulated depreciation and amortization	(1,215)	(1,334)
DTE Gas | Storage
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	576	570
Accumulated depreciation and amortization	(146)	(172)
DTE Gas | Transmission and other
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,341	1,244
Accumulated depreciation and amortization	$ (403)	$ (409)