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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 2,033 | $ 1,725 | $ 1,558 | $ 2,013 | $ 1,727 | $ 1,507 | $ 1,382 | $ 1,802 | $ 7,329 | $ 6,418 | $ 6,624
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,114 | 1,043 | 989
Income from equity method investees |  |  |  |  |  |  |  |  | 10 | 5 | 10
Interest charges |  |  |  |  |  |  |  |  | 500 | 505 | 460
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 95 | 115 | 131
Net income (loss) available to common stockholders | 637 | $ 186 | $ 176 | $ 349 | 158 | $ 218 | $ 136 | $ 243 | 1,348 | 755 | 680
Plant, property, and equipment, gross | 29,893 |  |  |  | 27,870 |  |  |  | 29,893 | 27,870 | 25,368
Investments in equity method investees | 71 |  |  |  | 70 |  |  |  | 71 | 70 | 71
Total assets | 28,753 |  |  |  | 29,666 |  |  |  | 28,753 | 29,666 | 26,837
Capital expenditures |  |  |  |  |  |  |  |  | 2,161 | 2,275 | 2,139
Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 7,021 | 6,189 | 6,376
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,077 | 1,023 | 975
Interest charges |  |  |  |  |  |  |  |  | 311 | 320 | 297
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 156 | 173 | 185
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 866 | 814 | 741
Plant, property, and equipment, gross | 28,771 |  |  |  | 26,757 |  |  |  | 28,771 | 26,757 | 24,963
Total assets | 27,140 |  |  |  | 25,399 |  |  |  | 27,140 | 25,399 | 23,699
Capital expenditures |  |  |  |  |  |  |  |  | 2,144 | 2,167 | 2,134
Other reconciling items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1 | 1 | 1
Interest charges |  |  |  |  |  |  |  |  | 183 | 179 | 157
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (59) | (54) | (56)
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 458 | (96) | (95)
Plant, property, and equipment, gross | 23 |  |  |  | 21 |  |  |  | 23 | 21 | 20
Total assets | 431 |  |  |  | 3,132 |  |  |  | 431 | 3,132 | 2,740
Capital expenditures |  |  |  |  |  |  |  |  | 2 | 1 | 1
Other reconciling items | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1 | 1 | 1
Interest charges |  |  |  |  |  |  |  |  | 0 | 1 | 1
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | (1) | (1) | (1)
Plant, property, and equipment, gross | 23 |  |  |  | 21 |  |  |  | 23 | 21 | 20
Total assets | 21 |  |  |  | 29 |  |  |  | 21 | 29 | 20
Capital expenditures |  |  |  |  |  |  |  |  | 2 | 1 | 1
Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 4,958 | 4,372 | 4,439
Depreciation and amortization |  |  |  |  |  |  |  |  | 772 | 739 | 713
Interest charges |  |  |  |  |  |  |  |  | 207 | 217 | 213
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 117 | 115 | 134
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 565 | 554 | 509
Plant, property, and equipment, gross | 18,147 |  |  |  | 17,155 |  |  |  | 18,147 | 17,155 | 16,158
Total assets | 16,493 |  |  |  | 15,829 |  |  |  | 16,493 | 15,829 | 14,911
Capital expenditures |  |  |  |  |  |  |  |  | 1,153 | 1,281 | 1,162
Electric Utility | Operating Segments | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 4,958 | 4,372 | 4,439
Depreciation and amortization |  |  |  |  |  |  |  |  | 772 | 739 | 713
Interest charges |  |  |  |  |  |  |  |  | 207 | 217 | 213
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 117 | 115 | 134
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 565 | 554 | 509
Plant, property, and equipment, gross | 18,147 |  |  |  | 17,155 |  |  |  | 18,147 | 17,155 | 16,158
Total assets | 16,555 |  |  |  | 15,893 |  |  |  | 16,555 | 15,893 | 14,973
Capital expenditures |  |  |  |  |  |  |  |  | 1,153 | 1,281 | 1,162
Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,063 | 1,817 | 1,937
Depreciation and amortization |  |  |  |  |  |  |  |  | 304 | 283 | 261
Interest charges |  |  |  |  |  |  |  |  | 104 | 102 | 83
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 39 | 58 | 51
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 302 | 261 | 233
Plant, property, and equipment, gross | 10,601 |  |  |  | 9,581 |  |  |  | 10,601 | 9,581 | 8,785
Total assets | 10,517 |  |  |  | 9,429 |  |  |  | 10,517 | 9,429 | 8,659
Capital expenditures |  |  |  |  |  |  |  |  | 989 | 885 | 971
Gas Utility | Operating Segments | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,063 | 1,817 | 1,937
Depreciation and amortization |  |  |  |  |  |  |  |  | 304 | 283 | 261
Interest charges |  |  |  |  |  |  |  |  | 104 | 102 | 83
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 39 | 58 | 51
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 302 | 261 | 233
Plant, property, and equipment, gross | 10,601 |  |  |  | 9,581 |  |  |  | 10,601 | 9,581 | 8,785
Total assets | 10,564 |  |  |  | 9,477 |  |  |  | 10,564 | 9,477 | 8,706
Capital expenditures |  |  |  |  |  |  |  |  | 989 | 885 | 971
Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 308 | 229 | 248
Depreciation and amortization |  |  |  |  |  |  |  |  | 37 | 20 | 14
Income from equity method investees |  |  |  |  |  |  |  |  | 10 | 5 | 10
Interest charges |  |  |  |  |  |  |  |  | 6 | 7 | 7
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (2) | (4) | 2
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 23 | 36 | 33
Plant, property, and equipment, gross | 1,122 |  |  |  | 1,113 |  |  |  | 1,122 | 1,113 | 405
Investments in equity method investees | 71 |  |  |  | 70 |  |  |  | 71 | 70 | 71
Total assets | $ 1,312 |  |  |  | $ 1,276 |  |  |  | 1,312 | 1,276 | 527
Capital expenditures |  |  |  |  |  |  |  |  | $ 17 | $ 108 | $ 5

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