Preferred and Preferenced Securities (Details) (USD $)	Dec. 31, 2011
DTE Energy [Member]
Preferred and Preferenced Securities [Line Items]
Preferred	$ 0
Preferred	5,000,000
Detroit Edison [Member]
Preferred and Preferenced Securities [Line Items]
Preferred	$ 100
Preferred	6,747,484
Preference	$ 1
Preference	30,000,000
MichCon [Member]
Preferred and Preferenced Securities [Line Items]
Preferred	$ 1
Preferred	7,000,000
Preference	$ 1
Preference	4,000,000