Long-Term Debt (Long Term Debt Outstanding and Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt, total	$ 22,138
Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Long-term debt, gross	20,515	$ 18,020
Unamortized debt discount	(28)	(26)
Unamortized debt issuance costs	(114)	(100)
Long-term debt due within one year	(1,220)	(2,075)
Long-term debt (net of current portion)	$ 19,153	15,819
Unsecured
Debt Instrument [Line Items]
Interest rate	4.20%
Long-term debt, gross	$ 6,380	5,105
Securitization Bonds
Debt Instrument [Line Items]
Unamortized debt issuance costs	(7)	(8)
Long-term debt due within one year	(71)	(64)
Long-term debt (net of current portion)	$ 635	705
Junior Subordinated Debentures
Debt Instrument [Line Items]
Interest rate	4.80%
Long-term debt, gross	$ 910	910
Unamortized debt issuance costs	(26)	(27)
Long-term debt, total	884	883
DTE Electric
Debt Instrument [Line Items]
Long-term debt due within one year	(350)	(100)
Long-term debt, total	11,983
DTE Electric | Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Unamortized debt discount	(22)	(23)
Unamortized debt issuance costs	(73)	(73)
Long-term debt (net of current portion)	$ 10,825	10,174
DTE Electric | Principally Secured
Debt Instrument [Line Items]
Interest rate	3.90%
Long-term debt, gross	$ 11,270	10,370
DTE Electric | Securitization Bonds
Debt Instrument [Line Items]
Interest rate	5.40%
Long-term debt, gross	$ 713	777
Unamortized debt issuance costs	(7)	(8)
Long-term debt due within one year	(71)	(64)
Long-term debt (net of current portion)	$ 635	705
DTE Gas | Principally Secured
Debt Instrument [Line Items]
Interest rate	4.30%
Long-term debt, gross	$ 2,865	$ 2,545