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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | $ 7,261 | $ 8,320 | $ 7,075
Leasing income | 116 | 240 | 194
Financing income | 16 | 16 | 15
Alternative-revenue programs | 69 | 57 | 45
Revenues to be refunded |  | (37) |
Total operating revenue | 7,462 | 8,596 | 7,329
Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 4,686 | 5,395 | 4,915
Financing income | 10 | 10 | 10
Alternative-revenue programs | 49 | 43 | 33
Revenues to be refunded |  | (29) |
Total operating revenue | 4,745 | 5,419 | 4,958
Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 2,394 | 2,720 | 2,046
Financing income | 6 | 6 | 5
Alternative-revenue programs | 20 | 14 | 12
Revenues to be refunded |  | (8) |
Total operating revenue | 2,420 | 2,732 | 2,063
NorthStar Clean Energy | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 181 | 205 | 114
Leasing income | 116 | 240 | 194
Total operating revenue | 297 | 445 | 308
Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 7,080 | 8,115 | 6,961
Financing income | 16 | 16 | 15
Alternative-revenue programs | 69 | 57 | 45
Revenues to be refunded |  | (37) |
Other non-segment revenue | 1 |  |
Total operating revenue | 7,166 | 8,151 | 7,021
Consumers Energy Company | Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 4,686 | 5,395 | 4,915
Financing income | 10 | 10 | 10
Alternative-revenue programs | 49 | 43 | 33
Revenues to be refunded |  | (29) |
Total operating revenue | 4,745 | 5,419 | 4,958
Consumers Energy Company | Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 2,394 | 2,720 | 2,046
Financing income | 6 | 6 | 5
Alternative-revenue programs | 20 | 14 | 12
Revenues to be refunded |  | (8) |
Total operating revenue | 2,420 | 2,732 | 2,063
Residential | Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 3,855 | 4,402 | 3,798
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 2,236 | 2,523 | 2,402
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 1,619 | 1,879 | 1,396
Commercial | Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 2,039 | 2,292 | 1,969
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 1,550 | 1,733 | 1,573
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 489 | 559 | 396
Industrial | Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 720 | 867 | 678
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 660 | 792 | 624
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 60 | 75 | 54
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 181 | 205 | 114
Other | NorthStar Clean Energy | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 181 | 205 | 114
Other | Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 466 | 554 | 516
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | 240 | 347 | 316
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | $ 226 | $ 207 | $ 200

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