The increase in the fair value of plan assets from contributions made by the employer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)		9 Months Ended
	Feb. 17, 2015	Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contribution of common stock to VEBA Trust		$ 117,000,000
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by Employer		175,000,000
Pension Benefits \| DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by Employer		145,000,000
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contribution of common stock to VEBA Trust		117,000,000
VEBA Trust \| Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contribution of common stock to VEBA Trust	$ 117,000,000
VEBA Trust \| Other Postretirement Benefits \| DTE Gas
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Contributions by Employer		24,000,000
Maximum \| Other Postretirement Benefits \| DTE Electric
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Estimated Future Employer Contributions in Current Fiscal Year		$ 60,000,000