Property, Plant, and Equipment (Depreciation and Amortization) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 1,239	$ 1,148	$ 1,095
Regulatory assets and liabilities	344	297	259
Intangible assets	15	16	16
Other	8	7	7
Depreciation and amortization	1,606	1,468	1,377
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,029	951	890
Regulatory assets and liabilities	292	248	214
Other	5	5	5
Depreciation and amortization	$ 1,326	$ 1,204	$ 1,109