v3.26.3
Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 2,170 $ 1,975 $ 6,653 $ 6,171
Lease Income   41 64 117
Financing income 4 3 13 12
Alternative-revenue programs 2 2 5 6
Other 7   7  
Total operating revenue 2,183 2,021 6,742 6,306
Utility Revenue        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 2,032 1,908 6,358 5,989
Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 138 67 295 182
Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 2,032 1,908 6,358 5,989
Financing income 4 3 13 12
Alternative-revenue programs 2 2 5 6
Total operating revenue 2,038 1,913 6,376 6,007
Consumers Energy Company | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,085 981 3,546 3,201
Consumers Energy Company | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 611 622 1,882 1,842
Consumers Energy Company | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 230 210 660 622
Consumers Energy Company | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 106 95 270 324
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenue 2,183 2,021 6,742 6,306
Operating Segments | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Total operating revenue 2,038 1,913 6,376 6,007
Operating Segments | Electric Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,769 1,675 4,467 4,324
Financing income 3 2 8 7
Alternative-revenue programs 2 2 5 6
Total operating revenue 1,774 1,679 4,480 4,337
Operating Segments | Electric Utility | Utility Revenue        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,769 1,675 4,467 4,324
Operating Segments | Electric Utility | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,769 1,675 4,467 4,324
Financing income 3 2 8 7
Alternative-revenue programs 2 2 5 6
Total operating revenue 1,774 1,679 4,480 4,337
Operating Segments | Electric Utility | Consumers Energy Company | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 915 842 2,207 2,055
Operating Segments | Electric Utility | Consumers Energy Company | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 568 577 1,483 1,468
Operating Segments | Electric Utility | Consumers Energy Company | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 223 204 613 576
Operating Segments | Electric Utility | Consumers Energy Company | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 63 52 164 225
Operating Segments | Gas Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 263 233 1,891 1,665
Financing income 1 1 5 5
Alternative-revenue programs 0 0 0 0
Total operating revenue 264 234 1,896 1,670
Operating Segments | Gas Utility | Utility Revenue        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 263 233 1,891 1,665
Operating Segments | Gas Utility | Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 263 233 1,891 1,665
Financing income 1 1 5 5
Alternative-revenue programs 0 0 0 0
Total operating revenue 264 234 1,896 1,670
Operating Segments | Gas Utility | Consumers Energy Company | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 170 139 1,339 1,146
Operating Segments | Gas Utility | Consumers Energy Company | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 43 45 399 374
Operating Segments | Gas Utility | Consumers Energy Company | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 7 6 47 46
Operating Segments | Gas Utility | Consumers Energy Company | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 43 43 106 99
Operating Segments | NorthStar Clean Energy        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 138 67 295 182
Lease Income   41 64 117
Other 7   7  
Total operating revenue 145 108 366 299
Variable lease income   28 46 82
Operating Segments | NorthStar Clean Energy | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 138 $ 67 $ 295 $ 182