v3.25.2
Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 1,798 $ 1,576 $ 4,196 $ 3,720
Leasing income 34 24 76 51
Financing income 4 4 9 8
Total operating revenue 1,838 1,607 4,285 3,783
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenue 1,838 1,607 4,285 3,783
Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,355 1,221 2,649 2,350
Financing income 2 2 5 4
Total operating revenue 1,359 1,226 2,658 2,358
Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 385 305 1,432 1,268
Financing income 2 2 4 4
Total operating revenue 387 307 1,436 1,272
NorthStar Clean Energy | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 58 50 115 102
Leasing income 34 24 76 51
Total operating revenue 92 74 191 153
Variable lease income 23 13    
NorthStar Clean Energy | Operating Segments | Power Sales Agreement        
Disaggregation of Revenue [Line Items]        
Variable lease income     54 29
Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,740 1,526 4,081 3,618
Financing income 4 4 9 8
Alternative-revenue programs 2 3 4 4
Total operating revenue 1,746 1,533 4,094 3,630
Consumers Energy Company | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenue 1,746 1,533 4,094 3,630
Consumers Energy Company | Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,355 1,221 2,649 2,350
Financing income 2 2 5 4
Alternative-revenue programs 2 3 4 4
Total operating revenue 1,359 1,226 2,658 2,358
Consumers Energy Company | Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 385 305 1,432 1,268
Financing income 2 2 4 4
Alternative-revenue programs 0 0 0 0
Total operating revenue 387 307 1,436 1,272
Residential | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 895 753 2,220 1,943
Residential | Consumers Energy Company | Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 619 547 1,213 1,072
Residential | Consumers Energy Company | Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 276 206 1,007 871
Commercial | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 563 497 1,220 1,064
Commercial | Consumers Energy Company | Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 473 433 891 793
Commercial | Consumers Energy Company | Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 90 64 329 271
Industrial | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 209 182 412 362
Industrial | Consumers Energy Company | Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 199 174 372 330
Industrial | Consumers Energy Company | Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 10 8 40 32
Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 58 50 115 102
Other | NorthStar Clean Energy | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 58 50 115 102
Other | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 73 94 229 249
Other | Consumers Energy Company | Electric Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 64 67 173 155
Other | Consumers Energy Company | Gas Utility | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 9 $ 27 $ 56 $ 94