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Fair Value Measurements (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Restricted cash equivalents | $ 90 | $ 21
Derivative instruments | 5 | 2
Consumers Energy Company |  |
Assets |  |
Restricted cash equivalents | 89 | 21
Derivative instruments | 5 | 2
Fair Value, Inputs, Level 1 |  |
Assets |  |
Cash equivalents | 167 | 18
Restricted cash equivalents | 90 | 21
Nonqualified deferred compensation plan assets | 32 | 30
Liabilities |  |
Nonqualified deferred compensation plan liabilities | 32 | 30
Fair Value, Inputs, Level 1 | Consumers Energy Company |  |
Assets |  |
Cash equivalents | 154 | 0
Restricted cash equivalents | 89 | 21
Nonqualified deferred compensation plan assets | 23 | 22
Liabilities |  |
Nonqualified deferred compensation plan liabilities | 23 | 22
Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets |  |
Total assets | 294 | 71
Liabilities |  |
Total liabilities | 32 | 30
Fair Value, Inputs, Level 1, 2 and 3 | Consumers Energy Company |  |
Assets |  |
Total assets | 271 | 45
Liabilities |  |
Total liabilities | $ 23 | $ 22

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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