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Financial Instruments (Schedule of Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities |  |
Current accounts receivable and notes receivable | $ 4 | $ 6
Current portion of long-term debt | 503 | 975
Current portion of long-term payables | 1 |
Carrying Amount |  |
Assets |  |
Long-term receivables | 9 | 11
Liabilities |  |
Long-term debt | 16,051 | 15,483
Long-term payables | 11 | 11
Fair Value |  |
Assets |  |
Long-term receivables | 9 | 11
Liabilities |  |
Long-term debt | 15,229 | 14,305
Long-term payables | 11 | 11
Consumers Energy Company |  |
Liabilities |  |
Current accounts receivable and notes receivable | 4 | 6
Current portion of long-term debt | 503 | 725
Consumers Energy Company | Related Party |  |
Liabilities |  |
Notes receivable | 7 | 7
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 9 | 11
Notes receivable related party | 95 | 97
Liabilities |  |
Long-term payables | 4 | 5
Consumers Energy Company | Carrying Amount | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 11,427 | 10,762
Consumers Energy Company | Carrying Amount | Related Party |  |
Liabilities |  |
Long-term debt | 731 | 424
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 9 | 11
Notes receivable related party | 95 | 97
Liabilities |  |
Long-term payables | 4 | 5
Consumers Energy Company | Fair Value | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 10,619 | 9,757
Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | 531 | 303
Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Liabilities |  |
Long-term debt | 1,101 | 1,103
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 | 12,096 | 11,186
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 | 8,587 | 7,741
Level 2 | Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | 531 | 303
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 9 | 11
Liabilities |  |
Long-term debt | 2,032 | 2,016
Long-term payables | 11 | 11
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 9 | 11
Notes receivable related party | 95 | 97
Liabilities |  |
Long-term payables | 4 | 5
Level 3 | Consumers Energy Company | Fair Value | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 2,032 | 2,016
Level 3 | Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | $ 0 | $ 0

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