Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Aug. 31, 2024	May 31, 2024	Feb. 29, 2024
Debt Instrument [Line Items]
Amount	$ 4,250
Senior Notes | February 2024 5.10% Senior Notes maturing in 2029
Debt Instrument [Line Items]
Interest rate				5.10%
Amount				$ 1,200
Senior Notes | May 2024 5.85% Senior Notes maturing In 2034
Debt Instrument [Line Items]
Interest rate			5.85%
Amount			$ 850
Senior Notes | Series C 2.53% Senior Notes Due October 1, 2024
Debt Instrument [Line Items]
Interest rate	2.53%
Amount	$ 675
Senior Notes | Series F 4.22% Senior Notes Due November 1, 2024
Debt Instrument [Line Items]
Interest rate	4.22%
Amount	$ 1,300
Senior Notes | August 2024 4.95% Senior Notes
Debt Instrument [Line Items]
Interest rate		4.95%
Amount		$ 1,200
DTE Electric | Mortgage Bonds | February 2024 4.85% Mortgage Bonds maturing in 2026
Debt Instrument [Line Items]
Interest rate				4.85%
Amount				$ 500
DTE Electric | Mortgage Bonds | February 2024 5.20% Mortgage Bonds maturing in 2034
Debt Instrument [Line Items]
Interest rate				5.20%
Amount				$ 500