Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Schedule Of Carrying Amounts And Fair Values Of Financial Instruments

In Millions
	September 30, 2017															December 31, 2016
				Fair Value															Fair Value
	Carrying						Level									Carrying						Level
	Amount			Total			1			2			3			Amount			Total			1			2			3
CMS Energy, including Consumers
Assets
Long-term    receivables1		$	22		$	22		$	-		$	-		$	22		$	22		$	22		$	-		$	-		$	22
Notes    receivable2			1,382			1,479			-			-			1,479			1,326			1,415			-			-			1,415
Securities held    to maturity			16			16			-			16			-			13			13			-			13			-
Liabilities
Long-term    debt3			9,983			10,484			-			9,331			1,153			9,504			9,953			-			8,990			963
Long-term    payables4			18			18			-			-			18			17			17			-			-			17
Consumers
Assets
Long-term    receivables1		$	22		$	22		$	-		$	-		$	22		$	22		$	22		$	-		$	-		$	22
Notes    receivable5			46			46			-			-			46			45			45			-			-			45
Liabilities
Long-term    debt6			5,718			6,032			-			4,879			1,153			5,628			5,903			-			4,940			963

1Includes current accounts receivable of $14 million at September 30, 2017 and $12 million at December 31, 2016.

2Includes current portion of notes receivable of $228 million at September 30, 2017 and $219 million at December 31, 2016.

3Includes current portion of long-term debt of $959 million at September 30, 2017 and $864 million at December 31, 2016.

4Includes current portion of long-term payables of $1 million at September 30, 2017 and December 31, 2016.

5Includes current portion of notes receivable of $30 million at September 30, 2017 and $29 million at December 31, 2016.

6Includes current portion of long-term debt of $443 million at September 30, 2017 and $375 million at December 31, 2016.

Schedule Of Investment Securities

In Millions
	September 30, 2017												December 31, 2016
				Unrealized			Unrealized			Fair						Unrealized			Unrealized			Fair
	Cost			Gains			Losses			Value			Cost			Gains			Losses			Value
CMS Energy, including Consumers
Available for sale
DB SERP
Mutual funds		$	142		$	3		$	-		$	145		$	141		$	-		$	-		$	141
Held to maturity
Debt securities			16			-			-			16			13			-			-			13
Consumers
Available for sale
DB SERP
Mutual funds		$	103		$	2		$	-		$	105		$	102		$	-		$	-		$	102
CMS Energy    common stock			2			19			-			21			4			29			-			33

Consumers Energy Company [Member]

Schedule Of Carrying Amounts And Fair Values Of Financial Instruments

In Millions
	September 30, 2017															December 31, 2016
				Fair Value															Fair Value
	Carrying						Level									Carrying						Level
	Amount			Total			1			2			3			Amount			Total			1			2			3
CMS Energy, including Consumers
Assets
Long-term    receivables1		$	22		$	22		$	-		$	-		$	22		$	22		$	22		$	-		$	-		$	22
Notes    receivable2			1,382			1,479			-			-			1,479			1,326			1,415			-			-			1,415
Securities held    to maturity			16			16			-			16			-			13			13			-			13			-
Liabilities
Long-term    debt3			9,983			10,484			-			9,331			1,153			9,504			9,953			-			8,990			963
Long-term    payables4			18			18			-			-			18			17			17			-			-			17
Consumers
Assets
Long-term    receivables1		$	22		$	22		$	-		$	-		$	22		$	22		$	22		$	-		$	-		$	22
Notes    receivable5			46			46			-			-			46			45			45			-			-			45
Liabilities
Long-term    debt6			5,718			6,032			-			4,879			1,153			5,628			5,903			-			4,940			963

1Includes current accounts receivable of $14 million at September 30, 2017 and $12 million at December 31, 2016.

2Includes current portion of notes receivable of $228 million at September 30, 2017 and $219 million at December 31, 2016.

3Includes current portion of long-term debt of $959 million at September 30, 2017 and $864 million at December 31, 2016.

4Includes current portion of long-term payables of $1 million at September 30, 2017 and December 31, 2016.

5Includes current portion of notes receivable of $30 million at September 30, 2017 and $29 million at December 31, 2016.

6Includes current portion of long-term debt of $443 million at September 30, 2017 and $375 million at December 31, 2016.

Schedule Of Investment Securities

In Millions
	September 30, 2017												December 31, 2016
				Unrealized			Unrealized			Fair						Unrealized			Unrealized			Fair
	Cost			Gains			Losses			Value			Cost			Gains			Losses			Value
CMS Energy, including Consumers
Available for sale
DB SERP
Mutual funds		$	142		$	3		$	-		$	145		$	141		$	-		$	-		$	141
Held to maturity
Debt securities			16			-			-			16			13			-			-			13
Consumers
Available for sale
DB SERP
Mutual funds		$	103		$	2		$	-		$	105		$	102		$	-		$	-		$	102
CMS Energy    common stock			2			19			-			21			4			29			-			33