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

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Significant Accounting Policies [Line Items]

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- Definition

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

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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

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Unrecognized cost of unvested share-based compensation awards.

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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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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates	9.00%	22.00%	12.00%	22.00%
Effective tax rate increase (decrease)	(13.00%)		(10.00%)
Valuation allowance for AMT credit carryover	$ 20		$ 20
True-up adjustment to the remeasurement of deferred taxes			21
Unrecognized tax benefits	8		8
Unrecognized compensation cost	$ 86		$ 86
Recognition period (in years)			1 year 3 months 15 days
DTE Electric
Significant Accounting Policies [Line Items]
Estimated annual effective tax rates	21.00%	35.00%	22.00%	35.00%
Effective tax rate increase (decrease)	(14.00%)		(13.00%)
True-up adjustment to the remeasurement of deferred taxes			$ 7
Unrecognized tax benefits	$ 10		10
DTE Electric \| DTE Energy
Significant Accounting Policies [Line Items]
Income tax payable	4		4
Income tax receivable						$ 12
Allocated costs	$ 11	$ 10	$ 27	$ 28
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%