Financial and Other Derivative Instruments (Details 4)	Sep. 30, 2013 dte.volumes
Natural Gas Commodity Contract [Member]
Derivative [Line Items]
Volume of Commodity Contracts	683,113,433
Electricity [Member]
Derivative [Line Items]
Volume of Commodity Contracts	59,672,654
Foreign currency exchange contracts [Member]
Derivative [Line Items]
Volume of Commodity Contracts	48,741,288
FTR [Member]
Derivative [Line Items]
Volume of Commodity Contracts	13,005,024