Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenue	$ 1,725	$ 1,507	$ 5,296	$ 4,691
Operating Expenses
Fuel for electric generation	184	108	438	274
Purchased power – related parties	21	13	56	45
Maintenance and other operating expenses	410	281	1,076	885
Depreciation and amortization	250	226	832	763
General taxes	81	74	290	262
Total operating expenses	1,465	1,167	4,354	3,768
Operating Income	260	340	942	923
Other Income (Expense)
Interest income	0	1	2	3
Interest and dividend income – related parties	0	0	0	7
Allowance for equity funds used during construction	2	1	5	4
Income from equity method investees	4	0	8	1
Non-operating retirement benefits, net	40	29	121	90
Other income	1	1	7	3
Other expense	(3)	(4)	(7)	(9)
Total other income	44	28	136	99
Interest Charges
Interest on long-term debt	120	124	359	361
Interest expense – related parties	3	3	9	9
Other interest expense	3	4	8	10
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	125	130	374	378
Income Before Income Taxes	179	238	704	644
Income Tax Expense	26	40	90	88
Income From Continuing Operations	153	198	614	556
Income From Discontinued Operations, Net of Tax of $9, $4, $25, and $10	30	12	82	34
Net Income	183	210	696	590
Loss Attributable to Noncontrolling Interests	(6)	(8)	(18)	(7)
Net Income attributable to CMS Energy	189	218	714	597
Preferred Stock Dividends	3	0	3	0
Net Income Available to Common Stockholders	$ 186	$ 218	$ 711	$ 597
Basic earnings per average common share, income from continuing operations per average common share available to common stockholders (in dollars per share)	$ 0.54	$ 0.72	$ 2.18	$ 1.98
Basic earnings per average common share, income from discontinued operations per average common share available to common stockholders (in dollars per share)	0.10	0.04	0.28	0.12
Basic earnings per average common share (in dollars per share)	0.64	0.76	2.46	2.10
Diluted earnings per average common share, income from continuing operations per average common share available to common stockholders (in dollars per share)	0.54	0.72	2.18	1.97
Diluted earnings per average common share, income from discontinued operations per average common share available to common stockholders (in dollars per share)	0.10	0.04	0.28	0.12
Diluted earnings per average common share (in dollars per share)	$ 0.64	$ 0.76	$ 2.46	$ 2.09
Consumers Energy Company
Operating Revenue	$ 1,644	$ 1,450	$ 5,074	$ 4,524
Operating Expenses
Fuel for electric generation	147	85	340	207
Purchased and interchange power	450	420	1,200	1,121
Purchased power – related parties	21	13	56	45
Cost of gas sold	53	33	425	383
Maintenance and other operating expenses	390	266	1,021	846
Depreciation and amortization	241	223	804	753
General taxes	77	72	277	256
Total operating expenses	1,379	1,112	4,123	3,611
Operating Income	265	338	951	913
Other Income (Expense)
Interest income	1	1	2	3
Interest and dividend income – related parties	1	2	4	4
Allowance for equity funds used during construction	2	1	5	4
Non-operating retirement benefits, net	37	28	113	85
Other income	1	1	7	3
Other expense	(3)	(4)	(7)	(9)
Total other income	39	29	124	90
Interest Charges
Interest on long-term debt	74	76	220	227
Interest expense – related parties	3	3	9	9
Other interest expense	2	4	6	9
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	78	82	233	243
Income Before Income Taxes	226	285	842	760
Income Tax Expense	40	55	130	135
Net Income	186	230	712	625
Net Income attributable to CMS Energy	186	230	712	625
Preferred Stock Dividends	0	0	1	1
Net Income Available to Common Stockholders	186	230	711	624
Purchased and interchange power
Operating Expenses
Cost of goods and services sold	462	430	1,230	1,149
Cost of gas sold
Operating Expenses
Cost of goods and services sold	$ 57	$ 35	$ 432	$ 390