Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Schedule Of Net Benefit Costs

In Millions
	Pension
	Three Months Ended						Six Months Ended
June 30	2013			2012			2013			2012
CMS Energy, including Consumers
Net periodic pension cost
Service cost		$	14		$	12		$	27		$	24
Interest expense			23			25			47			50
Expected return on plan assets			(32)			(32)			(64)			(63)
Amortization of:
Net loss			24			19			48			38
Prior service cost			1			2			2			3
Net periodic pension cost		$	30		$	26		$	60		$	52
Consumers
Net periodic pension cost
Service cost		$	13		$	11		$	26		$	23
Interest expense			23			24			46			48
Expected return on plan assets			(32)			(31)			(63)			(61)
Amortization of:
Net loss			24			19			47			37
Prior service cost			1			2			2			3
Net periodic pension cost		$	29		$	25		$	58		$	50

In Millions
	OPEB
	Three Months Ended						Six Months Ended
June 30	2013			2012			2013			2012
CMS Energy, including Consumers
Net periodic OPEB cost
Service cost		$	9		$	8		$	18		$	16
Interest expense			19			20			38			41
Expected return on plan assets			(19)			(16)			(38)			(33)
Amortization of:
Net loss			10			12			21			23
Prior service credit			(5)			(5)			(10)			(10)
Net periodic OPEB cost		$	14		$	19		$	29		$	37
Consumers
Net periodic OPEB cost
Service cost		$	9		$	8		$	18		$	16
Interest expense			18			20			36			40
Expected return on plan assets			(17)			(16)			(35)			(31)
Amortization of:
Net loss			10			12			21			23
Prior service credit			(5)			(5)			(10)			(10)
Net periodic OPEB cost		$	15		$	19		$	30		$	38

Consumers Energy Company [Member]

Schedule Of Net Benefit Costs

In Millions
	Pension
	Three Months Ended						Six Months Ended
June 30	2013			2012			2013			2012
CMS Energy, including Consumers
Net periodic pension cost
Service cost		$	14		$	12		$	27		$	24
Interest expense			23			25			47			50
Expected return on plan assets			(32)			(32)			(64)			(63)
Amortization of:
Net loss			24			19			48			38
Prior service cost			1			2			2			3
Net periodic pension cost		$	30		$	26		$	60		$	52
Consumers
Net periodic pension cost
Service cost		$	13		$	11		$	26		$	23
Interest expense			23			24			46			48
Expected return on plan assets			(32)			(31)			(63)			(61)
Amortization of:
Net loss			24			19			47			37
Prior service cost			1			2			2			3
Net periodic pension cost		$	29		$	25		$	58		$	50

In Millions
	OPEB
	Three Months Ended						Six Months Ended
June 30	2013			2012			2013			2012
CMS Energy, including Consumers
Net periodic OPEB cost
Service cost		$	9		$	8		$	18		$	16
Interest expense			19			20			38			41
Expected return on plan assets			(19)			(16)			(38)			(33)
Amortization of:
Net loss			10			12			21			23
Prior service credit			(5)			(5)			(10)			(10)
Net periodic OPEB cost		$	14		$	19		$	29		$	37
Consumers
Net periodic OPEB cost
Service cost		$	9		$	8		$	18		$	16
Interest expense			18			20			36			40
Expected return on plan assets			(17)			(16)			(35)			(31)
Amortization of:
Net loss			10			12			21			23
Prior service credit			(5)			(5)			(10)			(10)
Net periodic OPEB cost		$	15		$	19		$	30		$	38