Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($)	1 Months Ended
	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 | June 2021 Variable Rate Term Loan maturing in 2028 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | LIBOR | Minimum
Debt Instrument [Line Items]
Variable rate	0.50%
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | Six-month LIBOR
Debt Instrument [Line Items]
Amount	$ 900,000,000
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | Three-month LIBOR
Debt Instrument [Line Items]
Amount	100,000,000
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