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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,975 | $ 1,711 | $ 6,171 | $ 5,431
Leasing income | 41 | 26 | 117 | 77
Financing income | 3 | 5 | 12 | 13
Total operating revenue | 2,021 | 1,743 | 6,306 | 5,526
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenue | 2,021 | 1,743 | 6,306 | 5,526
Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,675 | 1,443 | 4,324 | 3,793
Financing income | 2 | 4 | 7 | 8
Total operating revenue | 1,679 | 1,448 | 4,337 | 3,806
Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 233 | 212 | 1,665 | 1,480
Financing income | 1 | 1 | 5 | 5
Total operating revenue | 234 | 213 | 1,670 | 1,485
NorthStar Clean Energy | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 67 | 56 | 182 | 158
Leasing income | 41 | 26 | 117 | 77
Total operating revenue | 108 | 82 | 299 | 235
Variable lease income | 28 | 15 |  |
NorthStar Clean Energy | Operating Segments | Power Sales Agreement |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Variable lease income |  |  | 82 | 44
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,908 | 1,655 | 5,989 | 5,273
Financing income | 3 | 5 | 12 | 13
Alternative-revenue programs | 2 | 1 | 6 | 5
Total operating revenue | 1,913 | 1,661 | 6,007 | 5,291
Consumers Energy Company | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenue | 1,913 | 1,661 | 6,007 | 5,291
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,675 | 1,443 | 4,324 | 3,793
Financing income | 2 | 4 | 7 | 8
Alternative-revenue programs | 2 | 1 | 6 | 5
Total operating revenue | 1,679 | 1,448 | 4,337 | 3,806
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 233 | 212 | 1,665 | 1,480
Financing income | 1 | 1 | 5 | 5
Alternative-revenue programs | 0 | 0 | 0 | 0
Total operating revenue | 234 | 213 | 1,670 | 1,485
Residential | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 981 | 834 | 3,201 | 2,777
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 842 | 707 | 2,055 | 1,779
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 139 | 127 | 1,146 | 998
Commercial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 622 | 526 | 1,842 | 1,590
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 577 | 486 | 1,468 | 1,279
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 45 | 40 | 374 | 311
Industrial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 210 | 174 | 622 | 536
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 204 | 169 | 576 | 499
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 6 | 5 | 46 | 37
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 67 | 56 | 182 | 158
Other | NorthStar Clean Energy | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 67 | 56 | 182 | 158
Other | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 95 | 121 | 324 | 370
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 52 | 81 | 225 | 236
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 43 | $ 40 | $ 99 | $ 134

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