Short-Term Credit Arrangements and Borrowings (Details Textuals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 602,000,000us-gaap_LineOfCredit
Short-term Debt, Weighted Average Interest Rate	0.40%	0.20%
Line of Credit Facility, Dividend Restrictions	730,000,000
Retained Earnings (Accumulated Deficit)	4,578,000,000	4,150,000,000
Other Restrictions on Payment of Dividends	0
DTE Energy [Member]
Short-term Debt [Line Items]
Total Funded Debt to Total Capitalization Ratio	0.50
Other outstanding letters of credit	407,000,000
DTE Electric [Member]
Short-term Debt [Line Items]
Total Funded Debt to Total Capitalization Ratio	0.51
Other outstanding letters of credit	50,000,000
DTE Gas [Member]
Short-term Debt [Line Items]
Total Funded Debt to Total Capitalization Ratio	0.48
Other outstanding letters of credit	145,000,000
Letter of Credit [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	204,000,000
Letter of Credit [Member] \| DTE Energy [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	204,000,000
Letter of Credit [Member] \| DTE Electric [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Letter of Credit [Member] \| DTE Gas [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Demand Financing Agreement [Member] \| DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	100,000,000
Maximum Additional Margin Financing	50,000,000
Financing Agreement, Amount Outstanding	37,000,000	138,000,000
Demand Financing Agreement Plus Letter of Credit [Member] \| DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	150,000,000
Other outstanding letters of credit [Member] \| Letter of Credit [Member] \| DTE Energy [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	35,000,000
Demand Financing Agreement [Member] \| Letter of Credit [Member] \| DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	$ 50,000,000
Maximum
Short-term Debt [Line Items]
Total Funded Debt to Total Capitalization Ratio	0.65

Amount borrowed under the financing agreement as of the balance sheet date.

No definition available.

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- Definition

Maximum borrowing capacity under the financing agreement without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the agreement.

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Dividend Restrictions, Amount

+ References

No definition available.

+ Details

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- Definition

Maximum Additional Margin Financing

+ References

No definition available.

+ Details

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- Definition

Other Restrictions on Payment of Dividends, Amount

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

-Article 5

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