Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Benefit Costs

In Millions
	Pension							OPEB
Three Months Ended March 31	2014			2013			2014			2013
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	10		$	13		$	5		$	9
Interest expense			25			24			14			19
Expected return on plan assets			(34)			(32)			(22)			(19)
Amortization of:
Net loss			15			24			-			11
Prior service cost (credit)			-			1			(10)			(5)
Net periodic cost (credit)		$	16		$	30		$	(13)		$	15
Consumers
Net periodic cost (credit)
Service cost		$	10		$	13		$	5		$	9
Interest expense			24			23			13			18
Expected return on plan assets			(33)			(31)			(21)			(18)
Amortization of:
Net loss			14			23			1			11
Prior service cost (credit)			-			1			(10)			(5)
Net periodic cost (credit)		$	15		$	29		$	(12)		$	15

Consumers Energy Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Benefit Costs

In Millions
	Pension							OPEB
Three Months Ended March 31	2014			2013			2014			2013
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	10		$	13		$	5		$	9
Interest expense			25			24			14			19
Expected return on plan assets			(34)			(32)			(22)			(19)
Amortization of:
Net loss			15			24			-			11
Prior service cost (credit)			-			1			(10)			(5)
Net periodic cost (credit)		$	16		$	30		$	(13)		$	15
Consumers
Net periodic cost (credit)
Service cost		$	10		$	13		$	5		$	9
Interest expense			24			23			13			18
Expected return on plan assets			(33)			(31)			(21)			(18)
Amortization of:
Net loss			14			23			1			11
Prior service cost (credit)			-			1			(10)			(5)
Net periodic cost (credit)		$	15		$	29		$	(12)		$	15