Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Year Ended December 31, 2011	Number of Shares			Weighted- Average Grant Date Fair Value per Share
CMS ENERGY, INCLUDING CONSUMERS
Nonvested at beginning of period		1,993,465		$	13.26
Granted1		787,149			13.89
Vested		(917,190	)		7.64
Forfeited		(15,356	)		16.94
Nonvested at end of period		1,848,068		$	16.29
CONSUMERS
Nonvested at beginning of period		1,805,023		$	13.28
Granted1		737,504			14.17
Vested		(837,174	)		7.77
Forfeited		(15,356	)		16.94
Nonvested at end of period		1,689,997		$	16.36

¹  During 2011, CMS Energy granted 310,100 TSR shares, 215,400 time-lapse shares, 25,329 shares from dividends paid on TSR shares, and 236,320 shares granted as a result of the outcome of the TSR awards' market condition. During 2011, Consumers granted 295,035 TSR shares, 207,613 time-lapse shares, 23,328 shares from dividends paid on TSR shares, and 211,528 shares granted as a result of the outcome of the TSR awards' market condition.

Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions

	2011			2010			2009
Expected volatility		29.6	%		30.1	%		29.8	%
Expected dividend yield		4.6	%		2.4	%		2.0	%
Risk-free rate		1.0	%		0.9	%		1.8	%

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

In Millions
Years Ended December 31	2011		2010		2009
CMS ENERGY, INCLUDING CONSUMERS
Fair value of shares that vested during the year	$	7	$	7	$	4
Compensation expense recognized		10		9		9
Income tax benefit recognized		4		4		3
CONSUMERS
Fair value of shares that vested during the year	$	7	$	6	$	4
Compensation expense recognized		10		9		8
Income tax benefit recognized		4		3		3

Schedule of Share-based Compensation, Stock Options, Activity

Year Ended December 31, 2011	Options Outstanding, Fully  Vested, and Exercisable			Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(In Millions)
CMS ENERGY, INCLUDING CONSUMERS
Outstanding at beginning of period		437,080		$	22.34		1.1 years	$	(2	)
Granted		—			—
Exercised		(127,500	)		11.87
Cancelled or expired		(244,000	)		27.85
Outstanding at end of period		65,580		$	22.20		0.2 years	$	—
CONSUMERS
Outstanding at beginning of period		267,468		$	20.64		1.2 years	$	(1	)
Granted		—			—
Exercised		(92,968	)		10.25
Cancelled or expired		(113,000	)		28.34
Outstanding at end of period		61,500		$	22.20		0.2 years	$	—

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

Years Ended December 31	2011		2010		2009
CMS ENERGY, INCLUDING CONSUMERS
Weighted-average grant-date fair value per share
Restricted stock granted	$	13.89	$	16.22	$	13.49
CONSUMERS
Weighted-average grant-date fair value per share
Restricted stock granted	$	14.17	$	16.27	$	13.44

Consumers Energy Company [Member]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Year Ended December 31, 2011	Number of Shares			Weighted- Average Grant Date Fair Value per Share
CMS ENERGY, INCLUDING CONSUMERS
Nonvested at beginning of period		1,993,465		$	13.26
Granted1		787,149			13.89
Vested		(917,190	)		7.64
Forfeited		(15,356	)		16.94
Nonvested at end of period		1,848,068		$	16.29
CONSUMERS
Nonvested at beginning of period		1,805,023		$	13.28
Granted1		737,504			14.17
Vested		(837,174	)		7.77
Forfeited		(15,356	)		16.94
Nonvested at end of period		1,689,997		$	16.36

¹  During 2011, CMS Energy granted 310,100 TSR shares, 215,400 time-lapse shares, 25,329 shares from dividends paid on TSR shares, and 236,320 shares granted as a result of the outcome of the TSR awards' market condition. During 2011, Consumers granted 295,035 TSR shares, 207,613 time-lapse shares, 23,328 shares from dividends paid on TSR shares, and 211,528 shares granted as a result of the outcome of the TSR awards' market condition.

Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions

	2011			2010			2009
Expected volatility		29.6	%		30.1	%		29.8	%
Expected dividend yield		4.6	%		2.4	%		2.0	%
Risk-free rate		1.0	%		0.9	%		1.8	%

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

In Millions
Years Ended December 31	2011		2010		2009
CMS ENERGY, INCLUDING CONSUMERS
Fair value of shares that vested during the year	$	7	$	7	$	4
Compensation expense recognized		10		9		9
Income tax benefit recognized		4		4		3
CONSUMERS
Fair value of shares that vested during the year	$	7	$	6	$	4
Compensation expense recognized		10		9		8
Income tax benefit recognized		4		3		3

Schedule of Share-based Compensation, Stock Options, Activity

Year Ended December 31, 2011	Options Outstanding, Fully  Vested, and Exercisable			Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(In Millions)
CMS ENERGY, INCLUDING CONSUMERS
Outstanding at beginning of period		437,080		$	22.34		1.1 years	$	(2	)
Granted		—			—
Exercised		(127,500	)		11.87
Cancelled or expired		(244,000	)		27.85
Outstanding at end of period		65,580		$	22.20		0.2 years	$	—
CONSUMERS
Outstanding at beginning of period		267,468		$	20.64		1.2 years	$	(1	)
Granted		—			—
Exercised		(92,968	)		10.25
Cancelled or expired		(113,000	)		28.34
Outstanding at end of period		61,500		$	22.20		0.2 years	$	—

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

Years Ended December 31	2011		2010		2009
CMS ENERGY, INCLUDING CONSUMERS
Weighted-average grant-date fair value per share
Restricted stock granted	$	13.89	$	16.22	$	13.49
CONSUMERS
Weighted-average grant-date fair value per share
Restricted stock granted	$	14.17	$	16.27	$	13.44