Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, total	$ 17,517
Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Long-term debt, gross	16,608	$ 18,393
Unamortized debt discount	(23)	(25)
Unamortized debt issuance costs	(90)	(104)
Long-term debt due within one year	(2,866)	(462)
Mortgage bonds, notes, and other	$ 13,629	17,802
Unsecured
Debt Instrument [Line Items]
Interest rate	2.10%
Long-term debt, gross	$ 5,555	8,175
Junior Subordinated Debentures
Debt Instrument [Line Items]
Interest rate	4.80%
Long-term debt, gross	$ 910	1,210
Unamortized debt issuance costs	(27)	(35)
Long-term debt, total	883	1,175
DTE Electric
Debt Instrument [Line Items]
Long-term debt due within one year	(316)	(462)
Mortgage bonds, notes, and other	8,591	7,774
Long-term debt, total	8,988
DTE Electric \| Mortgage Bonds, Notes and Other
Debt Instrument [Line Items]
Unamortized debt discount	(19)	(16)
Unamortized debt issuance costs	(62)	(56)
Mortgage bonds, notes, and other	$ 8,591	7,774
DTE Electric \| Principally Secured
Debt Instrument [Line Items]
Interest rate	3.70%
Long-term debt, gross	$ 8,988	8,308
DTE Gas \| Principally Secured
Debt Instrument [Line Items]
Interest rate	3.90%
Long-term debt, gross	$ 2,065	$ 1,910

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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