Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Benefit Costs

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	2019				2018				2019				2018				2019				2018				2019				2018
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	11			$	12			$	31			$	36			$	3			$	4			$	10			$	13
Interest cost		24				22				73				67				11				9				31				27
Expected return on plan assets		(40		)		(38		)		(121		)		(112		)		(22		)		(24		)		(66		)		(73		)
Amortization of:
Net loss		12				19				36				56				7				3				20				11
Prior service cost (credit)		—				1				1				2				(16		)		(16		)		(47		)		(50		)
Net periodic cost (credit)		$	7			$	16			$	20			$	49			$	(17	)		$	(24	)		$	(52	)		$	(72	)
Consumers
Net periodic cost (credit)
Service cost		$	10			$	12			$	30			$	35			$	3			$	4			$	10			$	12
Interest cost		23				22				69				64				10				8				30				25
Expected return on plan assets		(38		)		(35		)		(114		)		(104		)		(21		)		(22		)		(62		)		(68		)
Amortization of:
Net loss		12				17				35				53				7				4				20				12
Prior service cost (credit)		—				1				1				2				(15		)		(17		)		(46		)		(49		)
Net periodic cost (credit)		$	7			$	17			$	21			$	50			$	(16	)		$	(23	)		$	(48	)		$	(68	)

Consumers Energy Company

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Benefit Costs

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	2019				2018				2019				2018				2019				2018				2019				2018
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	11			$	12			$	31			$	36			$	3			$	4			$	10			$	13
Interest cost		24				22				73				67				11				9				31				27
Expected return on plan assets		(40		)		(38		)		(121		)		(112		)		(22		)		(24		)		(66		)		(73		)
Amortization of:
Net loss		12				19				36				56				7				3				20				11
Prior service cost (credit)		—				1				1				2				(16		)		(16		)		(47		)		(50		)
Net periodic cost (credit)		$	7			$	16			$	20			$	49			$	(17	)		$	(24	)		$	(52	)		$	(72	)
Consumers
Net periodic cost (credit)
Service cost		$	10			$	12			$	30			$	35			$	3			$	4			$	10			$	12
Interest cost		23				22				69				64				10				8				30				25
Expected return on plan assets		(38		)		(35		)		(114		)		(104		)		(21		)		(22		)		(62		)		(68		)
Amortization of:
Net loss		12				17				35				53				7				4				20				12
Prior service cost (credit)		—				1				1				2				(15		)		(17		)		(46		)		(49		)
Net periodic cost (credit)		$	7			$	17			$	21			$	50			$	(16	)		$	(23	)		$	(48	)		$	(68	)