v3.25.4
Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers $ 8,305 $ 7,320 $ 7,261
Leasing income 149 105 116
Financing income 16 15 16
Total operating revenue 8,539 7,515 7,462
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total operating revenue 8,539 7,515 7,462
Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 5,578 4,995 4,686
Financing income 10 10 10
Total operating revenue 5,638 5,061 4,745
Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 2,468 2,114 2,394
Financing income 6 5 6
Total operating revenue 2,493 2,138 2,420
NorthStar Clean Energy | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 259 211 181
Leasing income 149 105 116
Total operating revenue 408 316 297
Other      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 259 211 181
Other | NorthStar Clean Energy | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 259 211 181
Consumers Energy Company      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 8,046 7,109 7,080
Financing income 16 15 16
Alternative-revenue programs 69 75 69
Other non-segment revenue 1 1 1
Total operating revenue 8,132 7,200 7,166
Consumers Energy Company | Operating Segments      
Disaggregation of Revenue [Line Items]      
Total operating revenue 8,131 7,199 7,165
Consumers Energy Company | Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 5,578 4,995 4,686
Financing income 10 10 10
Alternative-revenue programs 50 56 49
Total operating revenue 5,638 5,061 4,745
Consumers Energy Company | Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 2,468 2,114 2,394
Financing income 6 5 6
Alternative-revenue programs 19 19 20
Total operating revenue 2,493 2,138 2,420
Consumers Energy Company | Residential      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 4,362 3,747 3,855
Consumers Energy Company | Residential | Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 2,661 2,318 2,236
Consumers Energy Company | Residential | Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 1,701 1,429 1,619
Consumers Energy Company | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 2,426 2,114 2,039
Consumers Energy Company | Commercial | Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 1,888 1,674 1,550
Consumers Energy Company | Commercial | Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 538 440 489
Consumers Energy Company | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 824 720 720
Consumers Energy Company | Industrial | Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 762 670 660
Consumers Energy Company | Industrial | Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 62 50 60
Consumers Energy Company | Other      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 434 528 466
Consumers Energy Company | Other | Electric Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers 267 333 240
Consumers Energy Company | Other | Gas Utility | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue recognized from contracts with customers $ 167 $ 195 $ 226