Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	In Millions
March 31, 2012	Total		Level 1		Level 2		Level 3
CMS ENERGY, INCLUDING CONSUMERS
Assets
Cash equivalents	$	271	$	271	$	—	$	—
Restricted cash equivalents		14		14		—		—
Nonqualified deferred compensation plan assets		5		5		—		—
SERP
Mutual funds		126		126		—		—
Derivative instruments
Commodity contracts		3		1		1		1
Total	$	419	$	417	$	1	$	1
Liabilities
Nonqualified deferred compensation plan liabilities	$	5	$	5	$	—	$	—
Derivative instruments
Commodity contracts		7		—		5		2
Total	$	12	$	5	$	5	$	2
CONSUMERS
Assets
Cash equivalents	$	122	$	122	$	—	$	—
Restricted cash equivalents		13		13		—		—
CMS Energy common stock		29		29		—		—
Nonqualified deferred compensation plan assets		3		3		—		—
SERP
Mutual funds		85		85		—		—
Derivative instruments
Commodity contracts		1		—		—		1
Total	$	253	$	252	$	—	$	1
Liabilities
Nonqualified deferred compensation plan liabilities	$	3	$	3	$	—	$	—
Total	$	3	$	3	$	—	$	—

	In Millions
December 31, 2011	Total		Level 1		Level 2		Level 3
CMS ENERGY, INCLUDING CONSUMERS
Assets
Cash equivalents	$	109	$	109	$	—	$	—
Restricted cash equivalents		15		15		—		—
Nonqualified deferred compensation plan assets		4		4		—		—
SERP
Cash equivalents		1		1		—		—
Mutual funds		113		113		—		—
Derivative instruments
Commodity contracts		3		1		—		2
Total	$	245	$	243	$	—	$	2
Liabilities
Nonqualified deferred compensation plan liabilities	$	4	$	4	$	—	$	—
Derivative instruments
Commodity contracts		7		—		3		4
Total	$	11	$	4	$	3	$	4
CONSUMERS
Assets
Cash equivalents	$	56	$	56	$	—	$	—
Restricted cash equivalents		14		14		—		—
CMS Energy common stock		35		35		—		—
Nonqualified deferred compensation plan assets		3		3		—		—
SERP
Cash equivalents		1		1		—		—
Mutual funds		74		74		—		—
Derivative instruments
Commodity contracts		2		—		—		2
Total	$	185	$	183	$	—	$	2
Liabilities
Nonqualified deferred compensation plan liabilities	$	3	$	3	$	—	$	—
Total	$	3	$	3	$	—	$	—

Consumers Energy Company [Member]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	In Millions
March 31, 2012	Total		Level 1		Level 2		Level 3
CMS ENERGY, INCLUDING CONSUMERS
Assets
Cash equivalents	$	271	$	271	$	—	$	—
Restricted cash equivalents		14		14		—		—
Nonqualified deferred compensation plan assets		5		5		—		—
SERP
Mutual funds		126		126		—		—
Derivative instruments
Commodity contracts		3		1		1		1
Total	$	419	$	417	$	1	$	1
Liabilities
Nonqualified deferred compensation plan liabilities	$	5	$	5	$	—	$	—
Derivative instruments
Commodity contracts		7		—		5		2
Total	$	12	$	5	$	5	$	2
CONSUMERS
Assets
Cash equivalents	$	122	$	122	$	—	$	—
Restricted cash equivalents		13		13		—		—
CMS Energy common stock		29		29		—		—
Nonqualified deferred compensation plan assets		3		3		—		—
SERP
Mutual funds		85		85		—		—
Derivative instruments
Commodity contracts		1		—		—		1
Total	$	253	$	252	$	—	$	1
Liabilities
Nonqualified deferred compensation plan liabilities	$	3	$	3	$	—	$	—
Total	$	3	$	3	$	—	$	—

	In Millions
December 31, 2011	Total		Level 1		Level 2		Level 3
CMS ENERGY, INCLUDING CONSUMERS
Assets
Cash equivalents	$	109	$	109	$	—	$	—
Restricted cash equivalents		15		15		—		—
Nonqualified deferred compensation plan assets		4		4		—		—
SERP
Cash equivalents		1		1		—		—
Mutual funds		113		113		—		—
Derivative instruments
Commodity contracts		3		1		—		2
Total	$	245	$	243	$	—	$	2
Liabilities
Nonqualified deferred compensation plan liabilities	$	4	$	4	$	—	$	—
Derivative instruments
Commodity contracts		7		—		3		4
Total	$	11	$	4	$	3	$	4
CONSUMERS
Assets
Cash equivalents	$	56	$	56	$	—	$	—
Restricted cash equivalents		14		14		—		—
CMS Energy common stock		35		35		—		—
Nonqualified deferred compensation plan assets		3		3		—		—
SERP
Cash equivalents		1		1		—		—
Mutual funds		74		74		—		—
Derivative instruments
Commodity contracts		2		—		—		2
Total	$	185	$	183	$	—	$	2
Liabilities
Nonqualified deferred compensation plan liabilities	$	3	$	3	$	—	$	—
Total	$	3	$	3	$	—	$	—