Derivatives designated as hedging instruments.

Name:	dte_DerivativesDesignatedAsHedgingInstrumentsAbstract
Namespace Prefix:	dte
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Financial And Other Derivative Instruments.

+ Details

Name:	dte_FinancialAndOtherDerivativeInstrumentsTextualsAbstract
Namespace Prefix:	dte
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Gains Related To FTR.

+ Details

Name:	dte_GainsRelatedToFtr
Namespace Prefix:	dte
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Gross volume of derivative contracts outstanding.

+ Details

Name:	dte_GrossVolumeOfDerivativeContractsOutstandingAbstract
Namespace Prefix:	dte
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

value of transactions company would have been exposed to if credit rating below investment grade.

+ Details

Name:	dte_ValueOfTransactionsCompanyWouldHaveBeenExposedToIfCreditRatingBelowInvestmentGrade
Namespace Prefix:	dte
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Volume of derivative contracts.

+ Details

Name:	dte_VolumeOfDerivativeContracts
Namespace Prefix:	dte
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	instant

- Definition

The estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(2)

+ Details

Name:	us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph a
-Clause 1

+ Details

Name:	us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

Name:	us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17

+ Details

Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 4

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B

+ Details

Name:	us-gaap_DerivativeAssetsCurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DerivativeAssetsLiabilitiesAtFairValueNetByBalanceSheetClassificationAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

+ Details

Name:	us-gaap_DerivativeAssetsNoncurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossInStatementOfFinancialPerformanceAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17

+ Details

Name:	us-gaap_DerivativeLiabilitiesCurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B

+ Details

Name:	us-gaap_DerivativeLiabilitiesNoncurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financial and Other Derivative Instruments (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Derivatives not designated as hedging instruments:
Total derivatives not designated as hedging instruments, Assets	$ 1,795		$ 1,795		$ 2,848
Total derivatives not designated as hedging instruments, Liabilities	(1,848)		(1,848)		(2,935)
Total derivatives:
Current assets	109		109		131
Current liabilities	(110)		(110)		(142)
Noncurrent assets	49		49		77
Derivative liabilities	(74)		(74)		(110)
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	38	10	37	73
Financial and Other Derivative Instruments (Textuals) [Abstract]
Accumulated other comprehensive income reclassified to earnings was less than:			1
Hard and soft trigger provisions	236		236
Gains related to FTRs recognized in regulatory liabilities	4		3
Natural Gas [Member]
Gross volume of derivative contracts outstanding
Volume of derivative contracts	567029409		567029409
Natural Gas [Member] \| Operating Revenue Fuel Purchased [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	(4)	1	(10)	(6)
Natural Gas [Member] \| Operating Revenue [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	9	17	15	27
Natural Gas [Member]
Derivatives not designated as hedging instruments:
Total derivatives not designated as hedging instruments, Assets	1,239		1,239		1,986
Total derivatives not designated as hedging instruments, Liabilities	(1,337)		(1,337)		(2,118)
Electricity [Member]
Gross volume of derivative contracts outstanding
Volume of derivative contracts	56162251		56162251
Electricity [Member] \| Operating Revenue [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	30	(22)	29	49
Electricity [Member]
Derivatives not designated as hedging instruments:
Total derivatives not designated as hedging instruments, Assets	503		503		766
Total derivatives not designated as hedging instruments, Liabilities	(463)		(463)		(716)
Other [Member] \| Operating Revenue [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	2	1	8	1
Other [Member] \| Operation and Maintenance [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	0	(1)	0	(1)
Other [Member]
Derivatives not designated as hedging instruments:
Total derivatives not designated as hedging instruments, Assets	37		37		76
Total derivatives not designated as hedging instruments, Liabilities	(22)		(22)		(71)
Interest rate contracts [Member]
Derivatives designated as hedging instruments:
Total derivatives designated as hedging instruments, Assets	0		0		0
Total derivatives designated as hedging instruments, Liabilities	(1)		(1)		(1)
Foreign Exchange Contract Member
Gross volume of derivative contracts outstanding
Volume of derivative contracts	96943647		96943647
Foreign currency exchange contracts [Member] \| Operating Revenue [Member] \| Nondesignated [Member]
Gain (Loss) Recognized in Income on Derivative
Gain (Loss) Recognized in Income on Derivative	1	14	(5)	3
Foreign currency exchange contracts [Member]
Derivatives not designated as hedging instruments:
Total derivatives not designated as hedging instruments, Assets	16		16		20
Total derivatives not designated as hedging instruments, Liabilities	(26)		(26)		(30)
Estimate of Fair Value, Fair Value Disclosure [Member]
Total derivatives:
Current assets	1,277		1,277		2,011
Current liabilities	(1,312)		(1,312)		(2,041)
Noncurrent assets	518		518		837
Derivative liabilities	(537)		(537)		(895)
Total derivatives	1,795		1,795		2,848
Total derivatives	(1,849)		(1,849)		(2,936)
Counterparty Netting [Member]
Total derivatives:
Current assets	(1,168)		(1,168)		(1,871)
Current liabilities	1,168		1,168		1,871
Noncurrent assets	(463)		(463)		(760)
Derivative liabilities	463		463		760
Collateral Adjustment [Member]
Total derivatives:
Current assets	0		0		(9)
Current liabilities	34		34		28
Noncurrent assets	(6)		(6)		0
Derivative liabilities	$ 0		$ 0		$ 25