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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis:
In Millions
CMS Energy, including ConsumersConsumers
September 30
2025		December 31
2024		September 30
2025		December 31
2024
Assets1
Cash equivalents$75 $27 $— $— 
Restricted cash equivalents70 75 69 75 
Nonqualified deferred compensation plan assets35 34 27 25 
Derivative instruments3 2 3 2 
Total assets$183 $138 $99 $102 
Liabilities1
Nonqualified deferred compensation plan liabilities$35 $34 $27 $25 
Derivative instruments4 — — — 
Total liabilities$39 $34 $27 $25 
1All assets and liabilities were classified as Level 1 with the exception of derivative contracts, which were classified as Level 2 and 3.
Consumers Energy Company  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis:
In Millions
CMS Energy, including ConsumersConsumers
September 30
2025		December 31
2024		September 30
2025		December 31
2024
Assets1
Cash equivalents$75 $27 $— $— 
Restricted cash equivalents70 75 69 75 
Nonqualified deferred compensation plan assets35 34 27 25 
Derivative instruments3 2 3 2 
Total assets$183 $138 $99 $102 
Liabilities1
Nonqualified deferred compensation plan liabilities$35 $34 $27 $25 
Derivative instruments4 — — — 
Total liabilities$39 $34 $27 $25 
1All assets and liabilities were classified as Level 1 with the exception of derivative contracts, which were classified as Level 2 and 3.