Reportable Segments (Tables)

6 Months Ended

Jun. 30, 2011

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

Reconciliation of Segments to Consolidated

In Millions
	Three Months Ended						Six Months Ended
June 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	949		$	975		$	1,846		$	1,813
Gas utility		354			301			1,445			1,353
Enterprises		50			55			105			123
Other		11			9			23			18
Total Operating Revenue — CMS Energy	$	1,364		$	1,340		$	3,419		$	3,307
Consumers
Electric utility	$	949		$	975		$	1,846		$	1,813
Gas utility		354			301			1,445			1,353
Total Operating Revenue — Consumers	$	1,303		$	1,276		$	3,291		$	3,166
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	85		$	86		$	150		$	127
Gas utility		5			1			93			67
Enterprises		29			33			32			42
Discontinued operations		—			(16	)		2			(17	)
Other		(19	)		(24	)		(42	)		(54	)
Total Net Income Available to Common Stockholders — CMS Energy	$	100		$	80		$	235		$	165
Consumers
Electric utility	$	85		$	86		$	150		$	127
Gas utility		5			1			93			67
Other		1			—			1			—
Total Net Income Available to Common Stockholder — Consumers	$	91		$	87		$	244		$	194

Income Statement [Member]

Reconciliation of Segments to Consolidated

In Millions
	Three Months Ended						Six Months Ended
June 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	949		$	975		$	1,846		$	1,813
Gas utility		354			301			1,445			1,353
Enterprises		50			55			105			123
Other		11			9			23			18
Total Operating Revenue — CMS Energy	$	1,364		$	1,340		$	3,419		$	3,307
Consumers
Electric utility	$	949		$	975		$	1,846		$	1,813
Gas utility		354			301			1,445			1,353
Total Operating Revenue — Consumers	$	1,303		$	1,276		$	3,291		$	3,166
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	85		$	86		$	150		$	127
Gas utility		5			1			93			67
Enterprises		29			33			32			42
Discontinued operations		—			(16	)		2			(17	)
Other		(19	)		(24	)		(42	)		(54	)
Total Net Income Available to Common Stockholders — CMS Energy	$	100		$	80		$	235		$	165
Consumers
Electric utility	$	85		$	86		$	150		$	127
Gas utility		5			1			93			67
Other		1			—			1			—
Total Net Income Available to Common Stockholder — Consumers	$	91		$	87		$	244		$	194

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

Reconciliation of Segments to Consolidated

In Millions
	June 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,184	$	9,944
Gas utility1		4,086		4,063
Enterprises		106		102
Other		37		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,413	$	14,145
Consumers
Electric utility1	$	10,184	$	9,944
Gas utility1		4,086		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,285	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,831	$	9,321
Gas utility1		4,581		4,614
Enterprises		175		191
Other		1,358		1,490
Total Assets — CMS Energy	$	15,945	$	15,616
Consumers
Electric utility1	$	9,831	$	9,321
Gas utility1		4,581		4,614
Other		689		904
Total Assets — Consumers	$	15,101	$	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
	June 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,184	$	9,944
Gas utility1		4,086		4,063
Enterprises		106		102
Other		37		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,413	$	14,145
Consumers
Electric utility1	$	10,184	$	9,944
Gas utility1		4,086		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,285	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,822	$	9,321
Gas utility1		4,581		4,614
Enterprises		175		191
Other		1,358		1,490
Total Assets — CMS Energy	$	15,936	$	15,616
Consumers
Electric utility1	$	9,822	$	9,321
Gas utility1		4,581		4,614
Other		689		904
Total Assets — Consumers	$	15,092	$	14,839

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