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Reportable Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | $ 7,462 | $ 8,596 | $ 7,329
Depreciation and amortization | 1,180 | 1,126 | 1,114
Income from equity method investees | 7 | 3 | 10
Total interest charges | 643 | 519 | 500
Income Tax Expense | 147 | 93 | 95
Net income (loss) available to common stockholders | 877 | 827 | 1,348
Plant, property, and equipment, gross | 33,135 | 30,491 | 29,893
Investments | 76 | 71 | 71
Total assets | 33,517 | 31,353 | 28,753
Capital expenditures | 3,280 | 2,393 | 2,161
Consumers Energy Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 7,166 | 8,151 | 7,021
Depreciation and amortization | 1,137 | 1,088 | 1,077
Total interest charges | 448 | 335 | 311
Income Tax Expense | 161 | 140 | 156
Net income (loss) available to common stockholders | 865 | 943 | 866
Plant, property, and equipment, gross | 31,723 | 29,342 | 28,771
Total assets | 31,852 | 29,916 | 27,140
Capital expenditures | 3,145 | 2,280 | 2,144
Other reconciling items |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 2 | 1 | 1
Total interest charges | 202 | 182 | 183
Income Tax Expense | (22) | (51) | (59)
Net income (loss) available to common stockholders | (55) | (152) | 458
Plant, property, and equipment, gross | 30 | 30 | 23
Total assets | 202 | 109 | 431
Capital expenditures | 2 | 7 | 2
Other reconciling items | Consumers Energy Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 1 | 0 | 0
Depreciation and amortization | 2 | 1 | 1
Total interest charges | 2 | 1 | 0
Income Tax Expense | (4) | (1) | 0
Net income (loss) available to common stockholders | 0 | (2) | (1)
Plant, property, and equipment, gross | 38 | 29 | 23
Total assets | 38 | 30 | 21
Capital expenditures | 23 | 7 | 2
Electric Utility | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 4,745 | 5,419 | 4,958
Depreciation and amortization | 797 | 757 | 772
Total interest charges | 281 | 218 | 207
Income Tax Expense | 67 | 109 | 117
Net income (loss) available to common stockholders | 550 | 567 | 565
Plant, property, and equipment, gross | 19,302 | 17,870 | 18,147
Total assets | 19,358 | 17,907 | 16,493
Capital expenditures | 2,081 | 1,265 | 1,153
Electric Utility | Operating Segments | Consumers Energy Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 4,745 | 5,419 | 4,958
Depreciation and amortization | 797 | 757 | 772
Total interest charges | 285 | 218 | 207
Income Tax Expense | 67 | 109 | 117
Net income (loss) available to common stockholders | 550 | 567 | 565
Plant, property, and equipment, gross | 19,302 | 17,870 | 18,147
Total assets | 19,417 | 17,968 | 16,555
Capital expenditures | 2,081 | 1,265 | 1,153
Gas Utility | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 2,420 | 2,732 | 2,063
Depreciation and amortization | 338 | 330 | 304
Total interest charges | 158 | 116 | 104
Income Tax Expense | 98 | 32 | 39
Net income (loss) available to common stockholders | 315 | 378 | 302
Plant, property, and equipment, gross | 12,383 | 11,443 | 10,601
Total assets | 12,353 | 11,873 | 10,517
Capital expenditures | 1,041 | 1,008 | 989
Gas Utility | Operating Segments | Consumers Energy Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 2,420 | 2,732 | 2,063
Depreciation and amortization | 338 | 330 | 304
Total interest charges | 161 | 116 | 104
Income Tax Expense | 98 | 32 | 39
Net income (loss) available to common stockholders | 315 | 378 | 302
Plant, property, and equipment, gross | 12,383 | 11,443 | 10,601
Total assets | 12,397 | 11,918 | 10,564
Capital expenditures | 1,041 | 1,008 | 989
NorthStar Clean Energy | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 297 | 445 | 308
Depreciation and amortization | 43 | 38 | 37
Income from equity method investees | 7 | 3 | 10
Total interest charges | 2 | 3 | 6
Income Tax Expense | 4 | 3 | (2)
Net income (loss) available to common stockholders | 67 | 34 | 23
Plant, property, and equipment, gross | 1,420 | 1,148 | 1,122
Investments | 76 | 71 | 71
Total assets | 1,604 | 1,464 | 1,312
Capital expenditures | $ 156 | $ 113 | $ 17

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