Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 4,963	$ 5,051
Less amount due within one year	(263)	(303)
Long-term Debt, Excluding Current Maturities	4,221	4,105
Securitization bonds	302	479
Less amount due within one year	(177)	(164)
Detroit Edison Taxable Debt Principally Secured 5.0% due in 2013 to 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	5.00%
Long-term Debt	3,777	3,515
Detroit Edison Tax-Exempt Revenue Bonds 5.3% due in 2014 to 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	5.30%
Long-term Debt	707	893
Securitization Bonds 6.6% due in 2013 to 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	6.60%
Securitization bonds	479	643
Long-Term Debt Gross [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 4,484	$ 4,408