Regulatory Matters (Tables)

3 Months Ended

9 Months Ended

Mar. 31, 2011

Sep. 30, 2011

Regulatory Assets and Liabilities Disclosure [Abstract]

Net Over Under Recovery Including Interest and Cost of Power Sold PSCR Reconcilation [Table Text Block]

The following table summarizes Detroit Edison’s PSCR reconciliation filing currently pending with the MPSC:

		Net Under-Recovery,		PSCR Cost of
		Including Interest		Power Sold
PSCR Year	Date Filed	(in Millions)		(in Billions)
2010	March 2011	$	52.6	$	1.2

Net Over Recover Including Interest and Cost of Gas Sold GCR Reconciliation [Table Text Block]

The following table summarizes MichCon’s GCR reconciliation filing currently pending with the MPSC:

		Net Over-Recovery,		GCR Cost of
		Including Interest		Gas Sold
GCR Year	Date Filed	(in Millions)		(in Billions)
2009-2010	June 2010	$	5.9	$	1.0
2010-2011	June 2011	$	1.0	$	0.7