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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

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