Income Taxes (Tax Credit Sales Year of Sale) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Cash received for tax credit sales	$ 268	$ 231	$ 0

Proceeds from the Sale of Tax Credits, Net of Discount

No definition available.

Name:	dte_ProceedsFromTheSaleOfTaxCreditsNetOfDiscount
Namespace Prefix:	dte_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration