Long-Term Financings (Debt Redemptions) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Debt Instrument, Redemption [Line Items]
Amount	$ 230	$ 1,200
DTE Electric
Debt Instrument, Redemption [Line Items]
Amount	230	$ 400
DTE Electric | Securitization Bonds
Debt Instrument, Redemption [Line Items]
Amount	$ 230
DTE Electric | Securitization Bonds | Securitization Bonds 5.97% Due 2026
Debt Instrument, Redemption [Line Items]
Interest Rate	5.97%
Amount	$ 16
DTE Electric | Securitization Bonds | Securitization Bonds 2.64% Due 2026
Debt Instrument, Redemption [Line Items]
Interest Rate	2.64%
Amount	$ 21
DTE Electric | Mortgages | Mortgage Bonds 3.77% Due 2026
Debt Instrument, Redemption [Line Items]
Interest Rate	3.77%
Amount	$ 100
DTE Electric | Mortgages | Mortgage Bonds 4.46% Due 2026
Debt Instrument, Redemption [Line Items]
Interest Rate	4.46%
Amount	$ 77