Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

	2012			2011
	(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured
5.4% due 2013 to 2033	$	1,298		$	1,298
DTE Electric Taxable Debt, Principally Secured
5.0% due 2013 to 2042	3,777			3,515
DTE Electric Tax-Exempt Revenue Bonds (b)
5.3% due 2014 to 2038	707			893
DTE Gas Taxable Debt, Principally Secured
5.6% due 2013 to 2042	919			889
Other Long-Term Debt, Including Non-Recourse Debt	153			165
	6,854			6,760
Less amount due within one year	(634		)	(355		)
	$	6,220		$	6,405
Securitization bonds
6.6% due 2013 to 2015	$	479		$	643
Less amount due within one year	(177		)	(164		)
	$	302		$	479
Junior Subordinated Debentures
6.5% due 2061	$	280		$	280
5.25% due 2062	200			—
	$	480		$	280

Schedule of Issued Debt [Table Text Block]

Company	Month Issued	Type	Interest Rate		Maturity	Amount
	(In millions)
DTE Electric	June	Mortgage Bonds (a)	2.65	%	2022	$	250
DTE Electric	June	Mortgage Bonds (a)	3.95	%	2042	250
DTE Energy	October	Junior Subordinated Debentures (b)	5.25	%	2062	200
DTE Gas	December	Mortgage Bonds (c)	3.92	%	2042	70
						$	770

Schedule of Extinguishment of Debt [Table Text Block]

Company	Month	Type	Interest Rate		Maturity	Amount
						(In millions)
DTE Electric	March/September	Securitization Bonds	6.42	%	2012	$	164
DTE Electric	April	Mortgage Bonds	7.90	%	2012	10
DTE Electric	April	Mortgage Bonds	8.36	%	2012	3
DTE Gas	May	Secured Medium Term Notes	7.06	%	2012	40
DTE Electric	July	Senior Notes	5.20	%	2012	225
DTE Electric	December	Tax Exempt Revenue Bonds (a)	3.05	%	2024	65
DTE Electric	December	Tax Exempt Revenue Bonds (a)	5.45	%	2032	64
DTE Electric	December	Tax Exempt Revenue Bonds (a)	5.25	%	2032	56
DTE Energy	Various	Other Long-Term Debt	Various		2012	12
						$	639

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Schedule of Maturities of Long-term Debt [Table Text Block]

	2013		2014		2015		2016		2017		2018 and Thereafter		Total
	(In millions)
Amount to mature	$	811	$	891	$	476	$	465	$	9	$	5,166	$	7,818