Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Amount	$ 4,100,000,000
DTE Electric | Mortgage Bonds | March 2021 1.9% Mortgage Bonds maturing in 2028
Debt Instrument [Line Items]
Interest rate			1.90%
Amount			$ 575,000,000
DTE Electric | Mortgage Bonds | March 2021 3.25% Mortgage Bonds maturing In 2051
Debt Instrument [Line Items]
Interest rate			3.25%
Amount			$ 425,000,000
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028
Debt Instrument [Line Items]
Amount		$ 1,000,000,000
DT Midstream | Senior Notes
Debt Instrument [Line Items]
Amount		$ 2,100,000,000
DT Midstream | Senior Notes | June 2021 4.125% Senior Notes maturing in 2029
Debt Instrument [Line Items]
Interest rate		4.125%
Amount		$ 1,100,000,000
DT Midstream | Senior Notes | June 2021 4.375% Senior Notes maturing in 2031
Debt Instrument [Line Items]
Interest rate		4.375%
Amount		$ 1,000,000,000