Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Effective Income Tax Rate Reconciliation, Percent	37.00%	34.00%	37.00%	35.00%
Unrecognized Tax Benefits	$ 3		$ 3
DTE Energy [Member]
Significant Accounting Policies [Line Items]
Income Taxes Receivable due from DTE Energy	16		16		23
Allocated Share-based Compensation Expense from DTE Energy	$ 10	$ 19	$ 29	$ 33

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

+ References

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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.

+ References

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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