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Financial Instruments (Schedule of Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Liabilities    
Current accounts receivable and notes receivable $ 6 $ 7
Current portion of long-term debt 975 1,090
Current portion of long-term payables   2
Carrying Amount    
Assets    
Long-term receivables 11 14
Liabilities    
Long-term debt 15,483 14,212
Long-term payables 11 9
Fair Value    
Assets    
Long-term receivables 11 14
Liabilities    
Long-term debt 14,305 12,384
Long-term payables 11 7
Consumers Energy Company    
Liabilities    
Current accounts receivable and notes receivable 6 7
Current portion of long-term debt 725 991
Consumers Energy Company | Related Party    
Liabilities    
Current portion of notes receivable, related party 7 7
Consumers Energy Company | Carrying Amount    
Assets    
Long-term receivables 11 14
Notes receivable related party 97 101
Liabilities    
Long-term payables 5 0
Consumers Energy Company | Carrying Amount | Nonrelated Party    
Liabilities    
Long-term debt 10,762 10,183
Consumers Energy Company | Carrying Amount | Related Party    
Liabilities    
Long-term debt 424 0
Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 11 14
Notes receivable related party 97 101
Liabilities    
Long-term payables 5 0
Consumers Energy Company | Fair Value | Nonrelated Party    
Liabilities    
Long-term debt 9,757 8,728
Consumers Energy Company | Fair Value | Related Party    
Liabilities    
Long-term debt 303 0
Level 1 | Fair Value    
Assets    
Long-term receivables 0 0
Liabilities    
Long-term debt 1,103 987
Long-term payables 0 0
Level 1 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable related party 0 0
Liabilities    
Long-term payables 0 0
Level 1 | Consumers Energy Company | Fair Value | Nonrelated Party    
Liabilities    
Long-term debt 0 0
Level 1 | Consumers Energy Company | Fair Value | Related Party    
Liabilities    
Long-term debt 0 0
Level 2 | Fair Value    
Assets    
Long-term receivables 0 0
Liabilities    
Long-term debt 11,186 8,741
Long-term payables 0 0
Level 2 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable related party 0 0
Liabilities    
Long-term payables 0 0
Level 2 | Consumers Energy Company | Fair Value | Nonrelated Party    
Liabilities    
Long-term debt 7,741 6,172
Level 2 | Consumers Energy Company | Fair Value | Related Party    
Liabilities    
Long-term debt 303 0
Level 3 | Fair Value    
Assets    
Long-term receivables 11 14
Liabilities    
Long-term debt 2,016 2,656
Long-term payables 11 7
Level 3 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 11 14
Notes receivable related party 97 101
Liabilities    
Long-term payables 5 0
Level 3 | Consumers Energy Company | Fair Value | Nonrelated Party    
Liabilities    
Long-term debt 2,016 2,556
Level 3 | Consumers Energy Company | Fair Value | Related Party    
Liabilities    
Long-term debt $ 0 $ 0