Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis:

In Millions
	CMS Energy, including Consumers					Consumers
December 31		2018		2017			2018		2017
Assets1
Cash equivalents		$	27	$	74		$	—	$	—
Restricted cash equivalents		21		17			17		17
CMS Energy common stock		—		—			1		21
Nonqualified deferred compensation plan assets		14		14			10		10
DB SERP
Cash equivalents		1		5			—		4
Debt securities		—		141			—		102
Derivative instruments		1		1			1		1
Total		$	64	$	252		$	29	$	155
Liabilities1
Nonqualified deferred compensation plan liabilities		$	14	$	14		$	10	$	10
Derivative instruments		3		1			—		—
Total		$	17	$	15		$	10	$	10

¹  All assets and liabilities were classified as Level 1 with the exception of derivative contracts, which were classified as Level 2 or Level 3.

Consumers Energy Company

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis:

In Millions
	CMS Energy, including Consumers					Consumers
December 31		2018		2017			2018		2017
Assets1
Cash equivalents		$	27	$	74		$	—	$	—
Restricted cash equivalents		21		17			17		17
CMS Energy common stock		—		—			1		21
Nonqualified deferred compensation plan assets		14		14			10		10
DB SERP
Cash equivalents		1		5			—		4
Debt securities		—		141			—		102
Derivative instruments		1		1			1		1
Total		$	64	$	252		$	29	$	155
Liabilities1
Nonqualified deferred compensation plan liabilities		$	14	$	14		$	10	$	10
Derivative instruments		3		1			—		—
Total		$	17	$	15		$	10	$	10

¹  All assets and liabilities were classified as Level 1 with the exception of derivative contracts, which were classified as Level 2 or Level 3.