Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Assets And Liabilities Measured At Fair Value On A Recurring Basis

In Millions
	CMS Energy, including Consumers						Consumers
December 31	2015			2014			2015			2014
Assets1
Cash equivalents		$	158		$	110		$	-		$	19
Restricted cash equivalents			19			38			19			38
CMS Energy common stock			-			-			29			38
Nonqualified deferred    compensation plan assets			10			8			7			6
DB SERP
Cash equivalents			2			4			2			3
Mutual funds			146			127			104			90
Derivative instruments
Commodity contracts			1			2			1			2
Total		$	336		$	289		$	162		$	196
Liabilities1
Nonqualified deferred    compensation plan liabilities		$	10		$	8		$	7		$	6
Derivative instruments
Commodity contracts			-			1			-			1
Total		$	10		$	9		$	7		$	7

¹ All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3 and which were insignificant at December 31, 2015 and 2014.

Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs

In Millions
Years Ended December 31	2015			2014			2013
CMS Energy, including Consumers
Balance at beginning of period		$	1		$	4		$	2
Total losses included in earnings1			(1)			-			-
Total gains (losses) offset through regulatory accounting			2			(15)			3
Purchases			1			(1)			-
Settlements			(2)			13			(1)
Balance at end of period		$	1		$	1		$	4
Unrealized losses included in earnings relating to assets and liabilities
still held at end of period1		$	-		$	-		$	(1)
Consumers
Balance at beginning of period		$	1		$	4		$	2
Total gains (losses) offset through regulatory accounting			2			(15)			3
Purchases			-			(1)			-
Settlements			(2)			13			(1)
Balance at end of period		$	1		$	1		$	4

¹ CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or purchased and interchange power on its consolidated statements of income.

Consumers Energy Company [Member]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

In Millions
	CMS Energy, including Consumers						Consumers
December 31	2015			2014			2015			2014
Assets1
Cash equivalents		$	158		$	110		$	-		$	19
Restricted cash equivalents			19			38			19			38
CMS Energy common stock			-			-			29			38
Nonqualified deferred    compensation plan assets			10			8			7			6
DB SERP
Cash equivalents			2			4			2			3
Mutual funds			146			127			104			90
Derivative instruments
Commodity contracts			1			2			1			2
Total		$	336		$	289		$	162		$	196
Liabilities1
Nonqualified deferred    compensation plan liabilities		$	10		$	8		$	7		$	6
Derivative instruments
Commodity contracts			-			1			-			1
Total		$	10		$	9		$	7		$	7

¹ All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3 and which were insignificant at December 31, 2015 and 2014.

Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs

In Millions
Years Ended December 31	2015			2014			2013
CMS Energy, including Consumers
Balance at beginning of period		$	1		$	4		$	2
Total losses included in earnings1			(1)			-			-
Total gains (losses) offset through regulatory accounting			2			(15)			3
Purchases			1			(1)			-
Settlements			(2)			13			(1)
Balance at end of period		$	1		$	1		$	4
Unrealized losses included in earnings relating to assets and liabilities
still held at end of period1		$	-		$	-		$	(1)
Consumers
Balance at beginning of period		$	1		$	4		$	2
Total gains (losses) offset through regulatory accounting			2			(15)			3
Purchases			-			(1)			-
Settlements			(2)			13			(1)
Balance at end of period		$	1		$	1		$	4

¹ CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or purchased and interchange power on its consolidated statements of income.