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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,955 | $ 1,671 | $ 6,115 | $ 5,148
Leasing income | 68 | 50 | 192 | 136
Financing income | 4 | 3 | 13 | 11
Consumers alternative-revenue programs |  |  | (2) | 1
Total operating revenue | 2,024 | 1,725 | 6,318 | 5,296
Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,591 | 1,416 | 4,151 | 3,705
Financing income | 3 | 2 | 8 | 7
Consumers alternative-revenue programs |  |  | 1 | 1
Total operating revenue | 1,594 | 1,419 | 4,160 | 3,713
Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 294 | 224 | 1,809 | 1,357
Financing income | 1 | 1 | 5 | 4
Consumers alternative-revenue programs |  |  | (3) | 0
Total operating revenue | 292 | 225 | 1,811 | 1,361
NorthStar Clean Energy | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 70 | 31 | 155 | 86
Leasing income | 68 | 50 | 192 | 136
Total operating revenue | 138 | 81 | 347 | 222
Variable lease income | 57 | 35 | 154 | 94
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,885 | 1,640 | 5,960 | 5,062
Financing income | 4 | 3 | 13 | 11
Consumers alternative-revenue programs | (3) | 1 | (2) | 1
Total operating revenue | 1,886 | 1,644 | 5,971 | 5,074
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,591 | 1,416 | 4,151 | 3,705
Financing income | 3 | 2 | 8 | 7
Consumers alternative-revenue programs | 0 | 1 | 1 | 1
Total operating revenue | 1,594 | 1,419 | 4,160 | 3,713
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 294 | 224 | 1,809 | 1,357
Financing income | 1 | 1 | 5 | 4
Consumers alternative-revenue programs | (3) | 0 | (3) | 0
Total operating revenue | 292 | 225 | 1,811 | 1,361
Residential | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 957 | 861 | 3,194 | 2,764
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 767 | 718 | 1,955 | 1,847
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 190 | 143 | 1,239 | 917
Commercial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 566 | 492 | 1,690 | 1,449
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 515 | 456 | 1,319 | 1,191
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 51 | 36 | 371 | 258
Industrial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 236 | 172 | 654 | 494
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 226 | 167 | 601 | 458
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 10 | 5 | 53 | 36
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 70 | 31 | 155 | 86
Other | NorthStar Clean Energy | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 70 | 31 | 155 | 86
Other | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 126 | 115 | 422 | 355
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 83 | 75 | 276 | 209
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 43 | $ 40 | $ 146 | $ 146

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