Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Change in Asset Retirement Obligation

In Millions
	ARO															ARO
	Liability												Cash flow			Liability
Company and ARO Description	12/31/2016			Incurred			Settled			Accretion			Revisions			12/31/2017
CMS Energy, including Consumers
Consumers		$	446		$	5		$	(45)		$	23		$	-		$	429
Gas treating plant and gas wells			1			-			-			-			-			1
Total CMS Energy		$	447		$	5		$	(45)		$	23		$	-		$	430
Consumers
Coal ash disposal areas		$	201		$	-		$	(18)		$	8		$	-		$	191
Gas distribution cut, purge, and cap			182			3			(11)			12			-			186
Asbestos abatement			56			-			(16)			2			-			42
Renewable generation assets			7			2			-			1			-			10
Total Consumers		$	446		$	5		$	(45)		$	23		$	-		$	429

In Millions
	ARO															ARO
	Liability												Cash flow			Liability
Company and ARO Description	12/31/2015			Incurred			Settled			Accretion			Revisions			12/31/2016
CMS Energy, including Consumers
Consumers		$	438		$	3		$	(18)		$	23		$	-		$	446
Gas treating plant and gas wells			1			-			-			-			-			1
Total CMS Energy		$	439		$	3		$	(18)		$	23		$	-		$	447
Consumers
Coal ash disposal areas		$	200		$	-		$	(8)		$	9		$	-		$	201
Gas distribution cut, purge, and cap			178			2			(9)			11			-			182
Asbestos abatement			54			-			(1)			3			-			56
Renewable generation assets			6			1			-			-			-			7
Total Consumers		$	438		$	3		$	(18)		$	23		$	-		$	446

Consumers Energy Company [Member]

Schedule of Change in Asset Retirement Obligation

In Millions
	ARO															ARO
	Liability												Cash flow			Liability
Company and ARO Description	12/31/2016			Incurred			Settled			Accretion			Revisions			12/31/2017
CMS Energy, including Consumers
Consumers		$	446		$	5		$	(45)		$	23		$	-		$	429
Gas treating plant and gas wells			1			-			-			-			-			1
Total CMS Energy		$	447		$	5		$	(45)		$	23		$	-		$	430
Consumers
Coal ash disposal areas		$	201		$	-		$	(18)		$	8		$	-		$	191
Gas distribution cut, purge, and cap			182			3			(11)			12			-			186
Asbestos abatement			56			-			(16)			2			-			42
Renewable generation assets			7			2			-			1			-			10
Total Consumers		$	446		$	5		$	(45)		$	23		$	-		$	429

In Millions
	ARO															ARO
	Liability												Cash flow			Liability
Company and ARO Description	12/31/2015			Incurred			Settled			Accretion			Revisions			12/31/2016
CMS Energy, including Consumers
Consumers		$	438		$	3		$	(18)		$	23		$	-		$	446
Gas treating plant and gas wells			1			-			-			-			-			1
Total CMS Energy		$	439		$	3		$	(18)		$	23		$	-		$	447
Consumers
Coal ash disposal areas		$	200		$	-		$	(8)		$	9		$	-		$	201
Gas distribution cut, purge, and cap			178			2			(9)			11			-			182
Asbestos abatement			54			-			(1)			3			-			56
Renewable generation assets			6			1			-			-			-			7
Total Consumers		$	438		$	3		$	(18)		$	23		$	-		$	446