Effective Income Tax Rate Reconcilation, Share-based Compensation, Excess Tax Benefit, Percent

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- Definition

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

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- Definition

Significant Accounting Policies [Line Items]

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- Definition

Tax Cuts And Jobs Act, Measurement Period Adjustment, Increase (Decrease) In Effective Tax Rate

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No definition available.

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- Definition

Tax Cuts And Jobs Act, Measurement Period Adjustment, income Tax Expense (Benefit)

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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 unrecognized tax benefits.

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Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates	7.00%	25.00%	13.00%	23.00%
Effective tax rate increase (decrease)	(18.00%)		(10.00%)
Increase in annual production tax credits	4.00%
True-up adjustment to the remeasurement of deferred taxes			$ 21
Measurement period increase (decrease) in effective tax rate			3.00%
ASU 2016-09 excess tax benefit amount			$ 11
ASU 2016-09 excess tax benefit (percentage)			1.00%
Unrecognized tax benefits	$ 8		$ 8
Unrecognized compensation cost	$ 98		$ 98
Recognition period (in years)			1 year 6 months 7 days
DTE Electric
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates	21.00%	35.00%	23.00%	35.00%
Effective tax rate increase (decrease)	(14.00%)		(12.00%)
True-up adjustment to the remeasurement of deferred taxes			$ 8
Measurement period increase (decrease) in effective tax rate			2.00%
Unrecognized tax benefits	$ 10		$ 10
DTE Electric \| DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	12		12			$ 12
Allocated costs	$ 8	$ 10	$ 17	$ 18
Forecast
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates					12.00%
Forecast \| DTE Electric
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates					22.00%