Long-Term Debt (Long Term Debt Outstanding and Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, total	$ 18,127
Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Long-term debt, gross	17,002	$ 16,608
Unamortized debt discount	(26)	(23)
Unamortized debt issuance costs	(92)	(90)
Long-term debt due within one year	(1,077)	(2,866)
Long-term debt (net of current portion)	$ 15,807	13,629
Unsecured
Debt Instrument [Line Items]
Interest rate	3.40%
Long-term debt, gross	$ 5,105	5,555
Securitization Bonds
Debt Instrument [Line Items]
Unamortized debt issuance costs	(4)
Long-term debt due within one year	(39)	0
Long-term debt (net of current portion)	$ 172	0
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	(203)	(316)
Long-term debt, total	9,787
DTE Electric \| Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Unamortized debt discount	(22)	(19)
Unamortized debt issuance costs	(65)	(62)
Long-term debt (net of current portion)	$ 9,282	8,591
DTE Electric \| Principally Secured
Debt Instrument [Line Items]
Interest rate	3.70%
Long-term debt, gross	$ 9,572	8,988
DTE Electric \| Securitization Bonds
Debt Instrument [Line Items]
Interest rate	2.80%
Long-term debt, gross	$ 215	0
Unamortized debt issuance costs	(4)
Long-term debt due within one year	(39)	0
Long-term debt (net of current portion)	$ 172	0
DTE Gas \| Principally Secured
Debt Instrument [Line Items]
Interest rate	4.00%
Long-term debt, gross	$ 2,325	$ 2,065

Amount of debt and lease obligation, classified as current.

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