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Revenue (Components Of Operating Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 1,343 $ 1,347 $ 3,101 $ 3,304
Leasing income 35 42 74 90
Financing income 65 56 132 110
Total operating revenue 1,443 1,445 3,307 3,504
Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 17 16 36 35
Consumers Energy Company        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,326 1,331 3,065 3,269
Financing income 4 3 9 8
Total operating revenue 1,330 1,334 3,074 3,277
Consumers Energy Company | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 713 621 1,687 1,733
Consumers Energy Company | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 392 420 880 945
Consumers Energy Company | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 133 182 293 369
Consumers Energy Company | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 88 108 205 222
Operating Segments | Electric Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,020 1,026 2,045 2,126
Financing income 2 1 5 4
Total operating revenue 1,022 1,027 2,050 2,130
Operating Segments | Gas Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 306 305 1,020 1,143
Financing income 2 2 4 4
Total operating revenue 308 307 1,024 1,147
Operating Segments | Enterprises        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 17 16 36 35
Leasing income 35 42 74 90
Total operating revenue 52 58 110 125
Variable lease income 21 29 46 63
Operating Segments | Enterprises | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 17 16 36 35
Operating Segments | EnerBank        
Disaggregation of Revenue [Line Items]        
Financing income 61 53 123 102
Total operating revenue 61 53 123 102
Operating Segments | Consumers Energy Company | Electric Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 1,020 1,026 2,045 2,126
Financing income 2 1 5 4
Total operating revenue 1,022 1,027 2,050 2,130
Operating Segments | Consumers Energy Company | Electric Utility | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 507 423 988 946
Operating Segments | Consumers Energy Company | Electric Utility | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 341 362 680 713
Operating Segments | Consumers Energy Company | Electric Utility | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 126 174 266 336
Operating Segments | Consumers Energy Company | Electric Utility | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 46 67 111 131
Operating Segments | Consumers Energy Company | Gas Utility        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 306 305 1,020 1,143
Financing income 2 2 4 4
Total operating revenue 308 307 1,024 1,147
Operating Segments | Consumers Energy Company | Gas Utility | Residential        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 206 198 699 787
Operating Segments | Consumers Energy Company | Gas Utility | Commercial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 51 58 200 232
Operating Segments | Consumers Energy Company | Gas Utility | Industrial        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers 7 8 27 33
Operating Segments | Consumers Energy Company | Gas Utility | Other        
Disaggregation of Revenue [Line Items]        
Revenue recognized from contracts with customers $ 42 $ 41 $ 94 $ 91