v3.25.2
Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Disaggregation of Revenue [Line Items]          
Bad debt expense $ 8 $ 7 $ 20 $ 17  
Unbilled receivables 464   464   $ 584
Consumers Energy Company          
Disaggregation of Revenue [Line Items]          
Bad debt expense 8 $ 7 20 $ 17  
Unbilled receivables $ 464   $ 464   $ 584