Property, Plant, and Equipment (Depreciation and Amortization) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 1,095	$ 1,025	$ 927
Regulatory assets and liabilities	259	244	227
Intangible assets	16	16	9
Other	7	7	6
Depreciation and amortization	1,377	1,292	1,169
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	890	831	748
Regulatory assets and liabilities	214	207	193
Other	5	5	5
Depreciation and amortization	$ 1,109	$ 1,043	$ 946