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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Liabilities |  |
Current accounts receivable | $ 7 | $ 9
Current portion of long term debt | 990 | 373
Current portion of long-term payables | 1 | 23
Carrying Amount |  |
Assets |  |
Long-term receivables | 11 | 14
Liabilities |  |
Long-term debt | 13,675 | 12,419
Long-term payables | 9 | 31
Fair Value |  |
Assets |  |
Long-term receivables | 11 | 14
Liabilities |  |
Long-term debt | 11,679 | 13,800
Long-term payables | 9 | 32
Consumers Energy Company |  |
Liabilities |  |
Current accounts receivable | 7 | 9
Current portion of long term debt | 990 | 365
DB SERP note receivable – related party | 7 | 7
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 11 | 14
Notes receivable related party | 101 | 104
Liabilities |  |
Long-term debt | 9,746 | 8,415
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 11 | 14
Notes receivable related party | 101 | 104
Liabilities |  |
Long-term debt | 8,132 | 9,410
Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Liabilities |  |
Long-term debt | 1,034 | 1,189
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 debt | 0 | 0
Level 2 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Liabilities |  |
Long-term debt | 8,566 | 10,656
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 debt | 6,053 | 7,455
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 11 | 14
Liabilities |  |
Long-term debt | 2,079 | 1,955
Long-term payables | 9 | 32
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 11 | 14
Notes receivable related party | 101 | 104
Liabilities |  |
Long-term debt | $ 2,079 | $ 1,955

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