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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Liabilities |  |
Current accounts receivable and notes receivable | $ 6 | $ 7
Current portion of long term debt | 1,126 | 1,090
Current portion of long-term payables | 1 | 2
Carrying Amount |  |
Assets |  |
Long-term receivables | 13 | 14
Liabilities |  |
Long-term debt | 15,051 | 14,212
Long-term payables | 14 | 9
Fair Value |  |
Assets |  |
Long-term receivables | 13 | 14
Liabilities |  |
Long-term debt | 13,638 | 12,384
Long-term payables | 14 | 7
Consumers Energy Company |  |
Liabilities |  |
Current accounts receivable and notes receivable | 6 | 7
Current portion of long term debt | 691 | 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 | 13 | 14
Notes receivable related party | 99 | 101
Liabilities |  |
Long-term payables | 6 | 0
Consumers Energy Company | Carrying Amount | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 10,147 | 10,183
Consumers Energy Company | Carrying Amount | Related Party |  |
Liabilities |  |
Long-term debt | 235 | 0
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 13 | 14
Notes receivable related party | 99 | 101
Liabilities |  |
Long-term payables | 6 | 0
Consumers Energy Company | Fair Value | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 8,989 | 8,728
Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | 146 | 0
Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Liabilities |  |
Long-term debt | 1,076 | 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 | 10,389 | 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 | 7,001 | 6,172
Level 2 | Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | 146 | 0
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 13 | 14
Liabilities |  |
Long-term debt | 2,173 | 2,656
Long-term payables | 14 | 7
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 13 | 14
Notes receivable related party | 99 | 101
Liabilities |  |
Long-term payables | 6 | 0
Level 3 | Consumers Energy Company | Fair Value | Nonrelated Party |  |
Liabilities |  |
Long-term debt | 1,988 | 2,556
Level 3 | Consumers Energy Company | Fair Value | Related Party |  |
Liabilities |  |
Long-term debt | $ 0 | $ 0

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