Long-Term Debt (Long Term Debt Outstanding and Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, total	$ 19,707
Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Long-term debt, gross	18,020	$ 17,002
Unamortized debt discount	(26)	(26)
Unamortized debt issuance costs	(100)	(92)
Long-term debt due within one year	(2,075)	(1,077)
Long-term debt (net of current portion)	$ 15,819	15,807
Unsecured
Debt Instrument [Line Items]
Interest rate	3.30%
Long-term debt, gross	$ 5,105	5,105
Securitization Bonds
Debt Instrument [Line Items]
Unamortized debt issuance costs	(8)	(4)
Long-term debt due within one year	(64)	(39)
Long-term debt (net of current portion)	$ 705	172
Junior Subordinated Debentures
Debt Instrument [Line Items]
Interest rate	4.80%
Long-term debt, gross	$ 910	910
Unamortized debt issuance costs	(27)	(27)
Long-term debt, total	883	883
DTE Electric
Debt Instrument [Line Items]
Long-term debt due within one year	(100)	(203)
Long-term debt, total	11,147
DTE Electric | Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Unamortized debt discount	(23)	(22)
Unamortized debt issuance costs	(73)	(65)
Long-term debt (net of current portion)	$ 10,174	9,282
DTE Electric | Principally Secured
Debt Instrument [Line Items]
Interest rate	3.80%
Long-term debt, gross	$ 10,370	9,572
DTE Electric | Securitization Bonds
Debt Instrument [Line Items]
Interest rate	5.30%
Long-term debt, gross	$ 777	215
Unamortized debt issuance costs	(8)	(4)
Long-term debt due within one year	(64)	(39)
Long-term debt (net of current portion)	$ 705	172
DTE Gas | Principally Secured
Debt Instrument [Line Items]
Interest rate	4.20%
Long-term debt, gross	$ 2,545	$ 2,325