Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2012

Short-term Debt [Abstract]

Schedule of Short-term Debt [Table Text Block]

	DTE Energy		Detroit Edison		MichCon		Total
Unsecured letter of credit facility, expiring in May 2013	$	50	$	—	$	—	$	50
Unsecured letter of credit facility, expiring in August 2015	125		—		—		125
Unsecured revolving credit facility, expiring October 2016	1,100		300		400		1,800
Total credit facilities at June 30, 2012	$	1,275	$	300	$	400	$	1,975
Amounts outstanding at June 30, 2012:
Commercial paper issuances	39		—		—		39
Letters of credit	222		—		—		222
	261		—		—		261
Net availability at June 30, 2012	$	1,014	$	300	$	400	$	1,714