Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, excluding current maturities	$ 10,506	$ 8,280
Junior Subordinated Debentures	756	465
Long-term debt, total	11,372
Other long-term debt
Debt Instrument [Line Items]
Long-term debt, gross	92	105
Secured debt, unsecured debt, mortgage notes and other debt
Debt Instrument [Line Items]
Long-term debt, gross	10,592	8,815
Debt instrument, unamortized discount (premium), net	(10)	(10)
Unamortized debt issuance costs	(67)	(60)
Long-term debt due within one year	(9)	(465)
Long-term debt, excluding current maturities	10,506	8,280
Junior subordinated debentures
Debt Instrument [Line Items]
Unamortized debt issuance costs	(24)	(15)
Long-term debt, total	$ 756	465
5.6% junior subordinated debentures maturing 2076 \| Junior subordinated debentures
Debt Instrument [Line Items]
Interest rate	5.60%
Long-term debt, gross	$ 780	480
DTE Energy \| DTE Energy debt, 3% unsecured maturing 2033 \| Unsecured debt
Debt Instrument [Line Items]
Interest rate	3.00%
Long-term debt, gross	$ 3,325	1,950
DTE Electric
Debt Instrument [Line Items]
Long-term debt, gross	5,925	5,635
Long-term debt due within one year	0	(151)
Long-term debt, excluding current maturities	5,878	5,437
Long-term debt, total	5,925
DTE Electric \| Secured debt, unsecured debt, mortgage notes and other debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount (premium), net	(10)	(11)
Unamortized debt issuance costs	$ (37)	(36)
DTE Electric \| DTE Electric taxable debt, 4.4% principally secured maturing in 2046 \| Secured debt
Debt Instrument [Line Items]
Interest rate	4.40%
Long-term debt, gross	$ 5,615	5,325
DTE Electric \| DTE Electric tax-exempt, 4.3% revenue bonds maturing in 2029 \| Tax-exempt revenue bonds
Debt Instrument [Line Items]
Interest rate	4.30%
Long-term debt, gross	$ 310	310
DTE Gas \| DTE Gas taxable debt, 4.9% principally secured maturing in 2046 \| Secured debt
Debt Instrument [Line Items]
Interest rate	4.90%
Long-term debt, gross	$ 1,250	$ 1,125

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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-Name Accounting Standards Codification
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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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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion.

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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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