Quarterly Financial And Common Stock Information (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial and Common Stock Information [Line Items]

Schedule of Quarterly Financial Information Table

In Millions, Except Per Share Amounts
	2018
Quarters Ended	March 31			June 30			Sept 30			Dec 31
CMS Energy, including Consumers
Operating revenue		$	1,953		$	1,492		$	1,599		$	1,829
Operating income		363			255			294			250
Net income		241			140			169			109
Income attributable to noncontrolling interests		—			1			—			1
Net income available to common stockholders		241			139			169			108
Basic earnings per average common share1		0.86			0.49			0.60			0.38
Diluted earnings per average common share1		0.86			0.49			0.59			0.38
Consumers
Operating revenue		$	1,855		$	1,395		$	1,502		$	1,712
Operating income		334			229			271			231
Net income		242			152			180			131
Preferred stock dividends		—			1			—			1
Net income available to common stockholder		242			151			180			130

In Millions, Except Per Share Amounts
	2017
Quarters Ended	March 31			June 30			Sept 30			Dec 31
CMS Energy, including Consumers
Operating revenue		$	1,829		$	1,449		$	1,527		$	1,778
Operating income		388			241			330			379
Net income (loss)		199			93			172			(2		)
Income attributable to noncontrolling interests		—			1			—			1
Net income (loss) available to common stockholders		199			92			172			(3		)
Basic earnings (loss) per average common share1		0.71			0.33			0.61			(0.01		)
Diluted earnings (loss) per average common share1		0.71			0.33			0.61			(0.01		)
Consumers
Operating revenue		$	1,737		$	1,362		$	1,437		$	1,686
Operating income		359			222			308			363
Net income		211			104			181			136
Preferred stock dividends		—			1			—			1
Net income available to common stockholder		211			103			181			135

¹  The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.

Consumers Energy Company

Quarterly Financial and Common Stock Information [Line Items]

Schedule of Quarterly Financial Information Table

In Millions, Except Per Share Amounts
	2018
Quarters Ended	March 31			June 30			Sept 30			Dec 31
CMS Energy, including Consumers
Operating revenue		$	1,953		$	1,492		$	1,599		$	1,829
Operating income		363			255			294			250
Net income		241			140			169			109
Income attributable to noncontrolling interests		—			1			—			1
Net income available to common stockholders		241			139			169			108
Basic earnings per average common share1		0.86			0.49			0.60			0.38
Diluted earnings per average common share1		0.86			0.49			0.59			0.38
Consumers
Operating revenue		$	1,855		$	1,395		$	1,502		$	1,712
Operating income		334			229			271			231
Net income		242			152			180			131
Preferred stock dividends		—			1			—			1
Net income available to common stockholder		242			151			180			130

In Millions, Except Per Share Amounts
	2017
Quarters Ended	March 31			June 30			Sept 30			Dec 31
CMS Energy, including Consumers
Operating revenue		$	1,829		$	1,449		$	1,527		$	1,778
Operating income		388			241			330			379
Net income (loss)		199			93			172			(2		)
Income attributable to noncontrolling interests		—			1			—			1
Net income (loss) available to common stockholders		199			92			172			(3		)
Basic earnings (loss) per average common share1		0.71			0.33			0.61			(0.01		)
Diluted earnings (loss) per average common share1		0.71			0.33			0.61			(0.01		)
Consumers
Operating revenue		$	1,737		$	1,362		$	1,437		$	1,686
Operating income		359			222			308			363
Net income		211			104			181			136
Preferred stock dividends		—			1			—			1
Net income available to common stockholder		211			103			181			135

¹  The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.