Property, Plant, and Equipment (Depreciation and Amortization) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 997	$ 878	$ 829
Regulatory assets and liabilities	227	212	165
Intangible assets	33	27	29
Other	6	7	7
Depreciation and amortization	1,263	1,124	1,030
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	748	652	615
Regulatory assets and liabilities	193	179	133
Other	5	5	5
Depreciation and amortization	$ 946	$ 836	$ 753