Regulatory Matters (Tables) (Consumers Energy Company [Member])

9 Months Ended

Sep. 30, 2011

2011 Electric Rate Case [Member]

Schedule of Annual Rate Increase Requested

	In Millions
Components of the rate increase
Investment in rate base	$	81
Depreciation and property taxes		70
Impact of sales declines		50
Impact of reduced funding for customer assistance programs1		13
Reduced operating and maintenance costs		(17	)
Cost of capital		(2	)
Total	$	195

Power Supply Cost Recover (PSCR) [Member]

Schedule of Reconciliation Filings Pending with MPSC

PSCR Year	Date Filed	Net Underrecovery	PSCR Cost of Power Sold
2010	March 2011	$15 million	$1.7 billion

Gas Cost Recover (GCR) [Member]

Schedule of Reconciliation Filings Pending with MPSC

GCR Year	Date Filed	Net Overrecovery	GCR Cost of Gas Sold
2009-2010	June 2010	$1 million	$1.3 billion
2010-2011	June 2011	6 million	1.2 billion

2010 Gas Rate Case [Member]

Schedule Of Annual Rate Increase Authorized And Requested

In Millions
				Increase Originally
	Increase Authorized			Requested by
Components of the rate increase	by the MPSC			Consumers		Difference
Investment in rate base	$	29		$	30	$	(1	)
Impact of sales declines		15			4		11
Operating and maintenance costs		2			16		(14	)
Cost of capital		(15	)		5		(20	)
Total	$	31		$	55	$	(24	)

2011 Gas Rate Case [Member]

Schedule of Annual Rate Increase Requested

In Millions
Components of the rate increase
Investment in rate base	$	22
Impact of reduced funding for customer assistance programs1		19
Cost of capital		10
Impact of sales declines		2
Reduced operating and maintenance costs		(4	)
Total	$	49