Short-Term Credit Arrangements and Borrowings (Tables)

9 Months Ended

Sep. 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 September 30, 2012	$	1,275	$	300	$	400	$	1,975
Amounts outstanding at September 30, 2012:
Commercial paper issuances	—		—		98		98
Letters of credit	188		—		—		188
	188		—		98		286
Net availability at September 30, 2012	$	1,087	$	300	$	302	$	1,689