Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, total	$ 19,603
Unsecured
Debt Instrument [Line Items]
Interest rate	2.70%
Long-term debt, gross	$ 8,175	$ 6,625
Secured Debt, Unsecured Debt, Mortgage Notes and Other Debt
Debt Instrument [Line Items]
Long-term debt, gross	18,393	15,575
Unamortized debt discount	(25)	(24)
Unamortized debt issuance costs	(104)	(91)
Long-term debt due within one year	(462)	(682)
Mortgage bonds, notes, and other	$ 17,802	14,778
Junior Subordinated Debentures
Debt Instrument [Line Items]
Interest rate	5.30%
Long-term debt, gross	$ 1,210	1,180
Unamortized debt issuance costs	(35)	(34)
Long-term debt, total	1,175	1,146
DTE Electric
Debt Instrument [Line Items]
Long-term debt due within one year	(462)	(632)
Mortgage bonds, notes, and other	7,774	6,548
Long-term debt, total	$ 8,308
DTE Electric \| Principally Secured
Debt Instrument [Line Items]
Interest rate	3.90%
Long-term debt, gross	$ 8,030	6,930
DTE Electric \| Tax-Exempt Revenue Bonds
Debt Instrument [Line Items]
Interest rate	4.10%
Long-term debt, gross	$ 278	310
DTE Electric \| Secured Debt, Unsecured Debt, Mortgage Notes and Other Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,308	7,240
Unamortized debt discount	(16)	(15)
Unamortized debt issuance costs	(56)	(45)
Mortgage bonds, notes, and other	$ 7,774	6,548
DTE Gas \| Principally Secured
Debt Instrument [Line Items]
Interest rate	4.00%
Long-term debt, gross	$ 1,910	$ 1,710

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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Amount, after accumulated amortization, of debt discount (premium).

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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