Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, excluding current maturities	$ 10,982	$ 11,039
Long-term debt, total	13,746
Other Long-Term Debt
Debt Instrument [Line Items]
Long-term debt, gross	1	7
Secured Debt, Unsecured Debt, Mortgage Notes and Other Debt
Debt Instrument [Line Items]
Long-term debt, gross	12,566	11,227
Unamortized debt discount and premium, net	(16)	(15)
Unamortized debt issuance costs	(73)	(69)
Long-term debt due within one year	(1,495)	(104)
Long-term debt, excluding current maturities	$ 10,982	11,039
Junior Subordinated Debentures
Debt Instrument [Line Items]
Interest rate	5.50%
Long-term debt, gross	$ 1,180	1,180
Unamortized debt issuance costs	(35)	(35)
Long-term debt, total	1,145	1,145
DTE Electric
Debt Instrument [Line Items]
Long-term debt, gross	6,590	6,065
Long-term debt, excluding current maturities	6,538	6,017
Long-term debt, total	$ 6,590
DTE Electric \| Principally Secured
Debt Instrument [Line Items]
Interest rate	4.30%
Long-term debt, gross	$ 6,280	5,755
DTE Electric \| Tax-Exempt Revenue Bonds
Debt Instrument [Line Items]
Interest rate	4.30%
Long-term debt, gross	$ 310	310
DTE Electric \| Secured Debt, Unsecured Debt, Mortgage Notes and Other Debt
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	(11)	(10)
Unamortized debt issuance costs	$ (41)	(38)
DTE Gas \| Principally Secured
Debt Instrument [Line Items]
Interest rate	4.50%
Long-term debt, gross	$ 1,550	1,330
DTE Energy \| Unsecured
Debt Instrument [Line Items]
Interest rate	3.20%
Long-term debt, gross	$ 4,425	$ 3,825

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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