Retirement Benefits

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan Disclosure [Line Items]

Retirement Benefits

Retirement Benefits

CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans.

In November 2017, CMS Energy and Consumers approved certain amendments to the OPEB Plan, resulting in higher OPEB Plan credits in 2018 compared to 2017. Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefits plans:

In Millions
	DB Pension Plans																OPEB Plan
	Three Months Ended								Nine Months Ended								Three Months Ended								Nine Months Ended
September 30	2018				2017				2018				2017				2018				2017				2018				2017
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	12			$	12			$	36			$	34			$	4			$	5			$	13			$	15
Interest cost		22				23				67				67				9				13				27				39
Expected return on plan assets		(38		)		(39		)		(112		)		(115		)		(24		)		(22		)		(73		)		(67		)
Amortization of:
Net loss		19				20				56				60				3				7				11				23
Prior service cost (credit)		1				1				2				3				(16		)		(8		)		(50		)		(26		)
Net periodic cost (credit)		$	16			$	17			$	49			$	49			$	(24	)		$	(5	)		$	(72	)		$	(16	)
Consumers
Net periodic cost (credit)
Service cost		$	12			$	11			$	35			$	33			$	4			$	5			$	12			$	14
Interest cost		22				22				64				65				8				12				25				38
Expected return on plan assets		(35		)		(38		)		(104		)		(112		)		(22		)		(21		)		(68		)		(63		)
Amortization of:
Net loss		17				19				53				58				4				8				12				24
Prior service cost (credit)		1				1				2				3				(17		)		(8		)		(49		)		(25		)
Net periodic cost (credit)		$	17			$	15			$	50			$	47			$	(23	)		$	(4	)		$	(68	)		$	(12	)

Consumers Energy Company

Defined Benefit Plan Disclosure [Line Items]

Retirement Benefits

Retirement Benefits

CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans.

In November 2017, CMS Energy and Consumers approved certain amendments to the OPEB Plan, resulting in higher OPEB Plan credits in 2018 compared to 2017. Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefits plans:

In Millions
	DB Pension Plans																OPEB Plan
	Three Months Ended								Nine Months Ended								Three Months Ended								Nine Months Ended
September 30	2018				2017				2018				2017				2018				2017				2018				2017
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	12			$	12			$	36			$	34			$	4			$	5			$	13			$	15
Interest cost		22				23				67				67				9				13				27				39
Expected return on plan assets		(38		)		(39		)		(112		)		(115		)		(24		)		(22		)		(73		)		(67		)
Amortization of:
Net loss		19				20				56				60				3				7				11				23
Prior service cost (credit)		1				1				2				3				(16		)		(8		)		(50		)		(26		)
Net periodic cost (credit)		$	16			$	17			$	49			$	49			$	(24	)		$	(5	)		$	(72	)		$	(16	)
Consumers
Net periodic cost (credit)
Service cost		$	12			$	11			$	35			$	33			$	4			$	5			$	12			$	14
Interest cost		22				22				64				65				8				12				25				38
Expected return on plan assets		(35		)		(38		)		(104		)		(112		)		(22		)		(21		)		(68		)		(63		)
Amortization of:
Net loss		17				19				53				58				4				8				12				24
Prior service cost (credit)		1				1				2				3				(17		)		(8		)		(49		)		(25		)
Net periodic cost (credit)		$	17			$	15			$	50			$	47			$	(23	)		$	(4	)		$	(68	)		$	(12	)