Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Assets And Liabilities Measured At Fair Value On A Recurring Basis

In Millions
	CMS Energy, including Consumers						Consumers
December 31	2017			2016			2017			2016
Assets1
Cash equivalents		$	74		$	44		$	-		$	-
Restricted cash equivalents			17			19			17			19
CMS Energy common stock			-			-			21			33
Nonqualified deferred    compensation plan assets			14			12			10			8
DB SERP
Cash equivalents			5			3			4			2
Debt securities			141			-			102			-
Mutual funds			-			141			-			102
Derivative instruments
Commodity contracts			1			1			1			1
Total		$	252		$	220		$	155		$	165
Liabilities1
Nonqualified deferred    compensation plan liabilities		$	14		$	12		$	10		$	8
Derivative instruments
Commodity contracts			1			-			-			-
Total		$	15		$	12		$	10		$	8

1All assets and liabilities were classified as Level 1 with the exception of commodity contracts, which were classified as Level 3.

Consumers Energy Company [Member]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

In Millions
	CMS Energy, including Consumers						Consumers
December 31	2017			2016			2017			2016
Assets1
Cash equivalents		$	74		$	44		$	-		$	-
Restricted cash equivalents			17			19			17			19
CMS Energy common stock			-			-			21			33
Nonqualified deferred    compensation plan assets			14			12			10			8
DB SERP
Cash equivalents			5			3			4			2
Debt securities			141			-			102			-
Mutual funds			-			141			-			102
Derivative instruments
Commodity contracts			1			1			1			1
Total		$	252		$	220		$	155		$	165
Liabilities1
Nonqualified deferred    compensation plan liabilities		$	14		$	12		$	10		$	8
Derivative instruments
Commodity contracts			1			-			-			-
Total		$	15		$	12		$	10		$	8

1All assets and liabilities were classified as Level 1 with the exception of commodity contracts, which were classified as Level 3.