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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