Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Feb. 29, 2024
Debt Instrument [Line Items]
Amount	$ 2,200
Senior Notes | February 2024 5.10% Senior Notes maturing in 2029
Debt Instrument [Line Items]
Interest rate		5.10%
Amount		$ 1,200
Mortgage Bonds | February 2024 5.20% Mortgage Bonds maturing in 2034
Debt Instrument [Line Items]
Amount		$ 500
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%