Reportable Segments (Tables)

9 Months Ended

Sep. 30, 2011

Consumers Energy Company [Member] | Income Statement [Member]

Reconciliation of Segments to Consolidated

In Millions
	Three Months Ended						Nine Months Ended
September 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Enterprises		56			63			161			186
Other		11			10			34			28
Total Operating Revenue — CMS Energy	$	1,464		$	1,443		$	4,883		$	4,750
Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Total Operating Revenue — Consumers	$	1,397		$	1,370		$	4,688		$	4,536
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Enterprises		4			9			36			51
Discontinued operations		—			—			2			(17	)
Other		(19	)		(33	)		(61	)		(87	)
Total Net Income Available to Common Stockholders — CMS Energy	$	139		$	134		$	374		$	299
Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Other		—			1			1			1
Total Net Income Available to Common Stockholder — Consumers	$	154		$	159		$	398		$	353

Income Statement [Member]

Reconciliation of Segments to Consolidated

In Millions
	Three Months Ended						Nine Months Ended
September 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Enterprises		56			63			161			186
Other		11			10			34			28
Total Operating Revenue — CMS Energy	$	1,464		$	1,443		$	4,883		$	4,750
Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Total Operating Revenue — Consumers	$	1,397		$	1,370		$	4,688		$	4,536
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Enterprises		4			9			36			51
Discontinued operations		—			—			2			(17	)
Other		(19	)		(33	)		(61	)		(87	)
Total Net Income Available to Common Stockholders — CMS Energy	$	139		$	134		$	374		$	299
Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Other		—			1			1			1
Total Net Income Available to Common Stockholder — Consumers	$	154		$	159		$	398		$	353

Consumers Energy Company [Member] | Balance Sheet [Member]

Reconciliation of Segments to Consolidated

In Millions
	September 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Enterprises		109		102
Other		38		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,607	$	14,145
Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,475	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Enterprises		170		191
Other		1,329		1,490
Total Assets — CMS Energy	$	15,958	$	15,616
Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Other		599		904
Total Assets — Consumers	$	15,058	$	14,839

¹ Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.

Balance Sheet [Member]

Reconciliation of Segments to Consolidated

In Millions
	September 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Enterprises		109		102
Other		38		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,607	$	14,145
Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,475	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Enterprises		170		191
Other		1,329		1,490
Total Assets — CMS Energy	$	15,958	$	15,616
Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Other		599		904
Total Assets — Consumers	$	15,058	$	14,839

¹ Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.