Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)	Dec. 31, 2013 dte.volumes
Natural Gas [Member]
Derivative [Line Items]
Volume of Commodity Contracts	795,553,773
Electricity [Member]
Derivative [Line Items]
Volume of Commodity Contracts	55,658,483
Foreign currency exchange contracts [Member]
Derivative [Line Items]
Volume of Commodity Contracts	65,074,206
FTR [Member]
Derivative [Line Items]
Volume of Commodity Contracts	10,485,618