Property, Plant, and Equipment (Depreciation and Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 1,265	$ 1,316	$ 1,239
Regulatory assets and liabilities	550	394	344
Intangible assets	18	16	15
Other	8	6	8
Depreciation and amortization	1,841	1,732	1,606
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	1,039	1,089	1,029
Regulatory assets and liabilities	486	338	292
Other	5	5	5
Depreciation and amortization	$ 1,530	$ 1,432	$ 1,326