Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amortization of Regulatory Liability, Percent

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Increase (Decrease) in Effective Tax Rate from Prior Year, Percent

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Significant Accounting Policies [Line Items]

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Tax Credit Carryforward, Valuation Allowance, Alternative Minimum Tax

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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Percentage of increase (decrease) in effective tax rate for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.

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Amount of unrecognized tax benefits.

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Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Effective tax rate increase (decrease)	4.00%		0.00%
Valuation allowance for AMT credit carryover					$ 20
Remeasurement of deferred taxes					21
Unrecognized tax benefits	$ 8		$ 8
Unrecognized compensation cost	88		$ 88
Recognition period (in years)			1 year 3 months 18 days
Amortization of intangible assets	$ 7	$ 7	$ 21	$ 20
DTE Electric
Significant Accounting Policies [Line Items]
Effective tax rate increase (decrease)	(5.00%)		(6.00%)
Remeasurement of deferred taxes					7
Amortization of TCJA regulatory liability			4.00%
Annual production tax credits			1.00%
Measurement period adjustment, decrease to effective tax rate			0.01
Unrecognized tax benefits	$ 10		$ 10
DTE Electric \| DTE Energy
Significant Accounting Policies [Line Items]
Income tax payable	13		13
Income tax receivable					$ 8
Allocated costs	$ 9	$ 11	$ 33	$ 27