Long-Term Financings (Debt Issuances) (Details) - Mortgages [Member] - DTE Electric $ in Millions	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Amount	$ 1,600
February 2026 4.85% Mortgage Bonds Maturing In 2036
Debt Instrument [Line Items]
Interest Rate	4.85%
Amount	$ 800
February 2026 5.55% Mortgage Bonds Maturing In 2056
Debt Instrument [Line Items]
Interest Rate	5.55%
Amount	$ 800

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details