Financial and Other Derivative Instruments (Details 2)	Dec. 31, 2012 dte.volumes
Natural Gas [Member]
Derivative [Line Items]
Volume of Commodity Contracts	663,194,602
Electricity [Member]
Derivative [Line Items]
Volume of Commodity Contracts	48,524,412
Foreign currency exchange contracts [Member]
Derivative [Line Items]
Volume of Commodity Contracts	10,838,396
FTR [Member]
Derivative [Line Items]
Volume of Commodity Contracts	11,077,483