Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)	Mar. 31, 2014 dte.volumes
Natural Gas Commodity Contract [Member]
Derivative [Line Items]
Volume of Commodity Contracts	898,351,691
Electricity Commodity Contract [Member]
Derivative [Line Items]
Volume of Commodity Contracts	39,480,560
Foreign currency exchange contracts [Member]
Derivative [Line Items]
Volume of Commodity Contracts	91,295,991