Contingencies And Commitments (Tables)

12 Months Ended

Dec. 31, 2016

Site Contingency [Line Items]

Guarantees

In Millions
			Maximum			Carrying
Guarantee Description	Issue Date	Expiration Date	Obligation			Amount
CMS Energy, including Consumers
Indemnity obligations from stock and    asset sale agreements1	Various	Indefinite		$	153		$	7
Guarantees2	Various	Indefinite			48			-
Consumers
Guarantee2	July 2011	Indefinite		$	30		$	-

¹ These obligations arose from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy indemnified the purchaser for losses resulting from various matters, primarily claims related to taxes. CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.

² At Consumers, this obligation comprises a guarantee provided to the U.S. Department of Energy in connection with a settlement agreement regarding damages resulting from the department’s failure to accept spent nuclear fuel from nuclear power plants formerly owned by Consumers. At CMS Energy, the guarantee obligations comprise Consumers’ guarantee to the U.S. Department of Energy and CMS Energy’s 1994 guarantee of non-recourse revenue bonds issued by Genesee. For additional details on this guarantee, see Note 20, Variable Interest Entities.

Purchase Obligations

In Millions
	Payments Due
	Total			2017			2018			2019			2020			2021			Beyond  2021
CMS Energy, including Consumers
Total PPAs		$	9,356		$	1,008		$	1,031		$	1,021		$	1,051		$	1,044		$	4,201
Other			1,922			931			376			187			132			32			264
Consumers
PPAs
MCV PPA		$	3,010		$	326		$	331		$	330		$	344		$	325		$	1,354
Palisades PPA			1,994			354			365			376			388			398			113
Related-party PPAs			899			81			82			86			88			88			474
Other PPAs			3,453			247			253			229			231			233			2,260
Total PPAs		$	9,356		$	1,008		$	1,031		$	1,021		$	1,051		$	1,044		$	4,201
Other			1,651			895			347			157			102			19			131

Consumers Energy Company [Member]

Site Contingency [Line Items]

Guarantees

In Millions
			Maximum			Carrying
Guarantee Description	Issue Date	Expiration Date	Obligation			Amount
CMS Energy, including Consumers
Indemnity obligations from stock and    asset sale agreements1	Various	Indefinite		$	153		$	7
Guarantees2	Various	Indefinite			48			-
Consumers
Guarantee2	July 2011	Indefinite		$	30		$	-

¹ These obligations arose from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy indemnified the purchaser for losses resulting from various matters, primarily claims related to taxes. CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.

² At Consumers, this obligation comprises a guarantee provided to the U.S. Department of Energy in connection with a settlement agreement regarding damages resulting from the department’s failure to accept spent nuclear fuel from nuclear power plants formerly owned by Consumers. At CMS Energy, the guarantee obligations comprise Consumers’ guarantee to the U.S. Department of Energy and CMS Energy’s 1994 guarantee of non-recourse revenue bonds issued by Genesee. For additional details on this guarantee, see Note 20, Variable Interest Entities.

Purchase Obligations

In Millions
	Payments Due
	Total			2017			2018			2019			2020			2021			Beyond  2021
CMS Energy, including Consumers
Total PPAs		$	9,356		$	1,008		$	1,031		$	1,021		$	1,051		$	1,044		$	4,201
Other			1,922			931			376			187			132			32			264
Consumers
PPAs
MCV PPA		$	3,010		$	326		$	331		$	330		$	344		$	325		$	1,354
Palisades PPA			1,994			354			365			376			388			398			113
Related-party PPAs			899			81			82			86			88			88			474
Other PPAs			3,453			247			253			229			231			233			2,260
Total PPAs		$	9,356		$	1,008		$	1,031		$	1,021		$	1,051		$	1,044		$	4,201
Other			1,651			895			347			157			102			19			131

Manufactured Gas Plant [Member] | Consumers Energy Company [Member]

Site Contingency [Line Items]

Expected Remediation Cost By Year

In Millions
	2017			2018			2019			2020			2021
Consumers
Remediation and other response activity costs		$	35		$	14		$	19		$	10		$	5

Bay Harbor [Member]

Site Contingency [Line Items]

Expected Remediation Cost By Year

In Millions
	2017			2018			2019			2020			2021
CMS Energy
Long-term liquid disposal and operating and maintenance costs		$	5		$	4		$	4		$	4		$	4