Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 164	$ 452
Accounts receivable – intercompany and related parties	16	12
Prepayments and other current assets	113	139
Total current assets	3,433	2,627
Other Non‑current Assets
Other	310	264
Total other non‑current assets	5,207	3,774
Total Assets	31,353	28,753	$ 29,666
Current Liabilities
Accounts and notes payable – intercompany	8	11
Accrued interest, including intercompany	122	107
Accrued taxes	538	515
Other current liabilities	166	156
Total current liabilities	2,985	2,204
Non‑current Liabilities
Long-term debt	13,122	12,046
Postretirement benefits	108	142
Other non‑current liabilities	397	375
Total non‑current liabilities	20,773	19,361
Equity
Total common stockholders’ equity	6,791	6,407
Preferred stock	224	224
Total stockholders’ equity	7,015	6,631
Total Liabilities and Equity	31,353	28,753
CMS Energy
Current Assets
Cash and cash equivalents	36	390
DB SERP note receivable – related party	107	463
Accounts receivable – intercompany and related parties	8	5
Accrued taxes	45	0
Prepayments and other current assets	1	1
Total current assets	197	859
Other Non‑current Assets
Deferred income taxes	105	147
Investments in subsidiaries	10,881	9,870
Other investments	6	6
Other	11	8
Total other non‑current assets	11,003	10,031
Total Assets	11,200	10,890
Current Liabilities
Accounts and notes payable – intercompany	74	61
Accrued interest, including intercompany	33	33
Accrued taxes	0	83
Other current liabilities	9	8
Total current liabilities	116	185
Non‑current Liabilities
Long-term debt	3,930	3,928
Notes payable – intercompany	109	112
Postretirement benefits	15	19
Other non‑current liabilities	15	15
Total non‑current liabilities	4,069	4,074
Equity
Total common stockholders’ equity	6,791	6,407
Preferred stock	224	224
Total stockholders’ equity	7,015	6,631
Total Liabilities and Equity	$ 11,200	$ 10,890