Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2020

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	2020				2019				2020				2019				2020				2019				2020				2019
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	12			$	11			$	37			$	31			$	4			$	3			$	12			$	10
Interest cost		20				24				61				73				8				11				25				31
Expected return on plan assets		(47		)		(40		)		(143		)		(121		)		(25		)		(22		)		(75		)		(66		)
Settlement loss		1				—				1				—				—				—				—				—
Amortization of:
Net loss		23				12				67				36				4				7				11				20
Prior service cost (credit)		—				—				1				1				(14		)		(16		)		(42		)		(47		)
Net periodic cost (credit)		$	9			$	7			$	24			$	20			$	(23	)		$	(17	)		$	(69	)		$	(52	)
Consumers
Net periodic cost (credit)
Service cost		$	12			$	10			$	36			$	30			$	3			$	3			$	11			$	10
Interest cost		20				23				59				69				8				10				24				30
Expected return on plan assets		(45		)		(38		)		(136		)		(114		)		(23		)		(21		)		(70		)		(62		)
Amortization of:
Net loss		22				12				64				35				4				7				11				20
Prior service cost (credit)		—				—				1				1				(13		)		(15		)		(40		)		(46		)
Net periodic cost (credit)		$	9			$	7			$	24			$	21			$	(21	)		$	(16	)		$	(64	)		$	(48	)

Contributions: In January 2020, CMS Energy, including Consumers, contributed $531 million and Consumers contributed $518 million to the DB Pension Plans.

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	2020				2019				2020				2019				2020				2019				2020				2019
CMS Energy, including Consumers
Net periodic cost (credit)
Service cost		$	12			$	11			$	37			$	31			$	4			$	3			$	12			$	10
Interest cost		20				24				61				73				8				11				25				31
Expected return on plan assets		(47		)		(40		)		(143		)		(121		)		(25		)		(22		)		(75		)		(66		)
Settlement loss		1				—				1				—				—				—				—				—
Amortization of:
Net loss		23				12				67				36				4				7				11				20
Prior service cost (credit)		—				—				1				1				(14		)		(16		)		(42		)		(47		)
Net periodic cost (credit)		$	9			$	7			$	24			$	20			$	(23	)		$	(17	)		$	(69	)		$	(52	)
Consumers
Net periodic cost (credit)
Service cost		$	12			$	10			$	36			$	30			$	3			$	3			$	11			$	10
Interest cost		20				23				59				69				8				10				24				30
Expected return on plan assets		(45		)		(38		)		(136		)		(114		)		(23		)		(21		)		(70		)		(62		)
Amortization of:
Net loss		22				12				64				35				4				7				11				20
Prior service cost (credit)		—				—				1				1				(13		)		(15		)		(40		)		(46		)
Net periodic cost (credit)		$	9			$	7			$	24			$	21			$	(21	)		$	(16	)		$	(64	)		$	(48	)

Contributions: In January 2020, CMS Energy, including Consumers, contributed $531 million and Consumers contributed $518 million to the DB Pension Plans.