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Reportable Segments (Schedule of Financial Information by Reportable Segments, CMS Energy, including Consumers) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | $ 7,515 | $ 7,462 | $ 8,596
Power supply cost | 2,028 | 2,011 | 2,909
Maintenance and other operating expenses | 1,638 | 1,687 | 1,669
Depreciation and amortization | 1,240 | 1,180 | 1,126
General taxes | 482 | 447 | 412
Total operating expenses | 6,028 | 6,227 | 7,372
Operating Income | 1,487 | 1,235 | 1,224
Total other income | 344 | 362 | 197
Total interest charges | 708 | 643 | 519
Income (Loss) Before Income Taxes | 1,123 | 954 | 902
Income tax expense (benefit) | 176 | 147 | 93
Income (Loss) From Continuing Operations | 947 | 807 | 809
Other segment items | 46 | 70 | 18
Net Income (Loss) Available to Common Stockholders | 993 | 877 | 827
Plant, property, and equipment, gross | 34,932 | 33,135 |
Investments | 64 | 74 |
Total assets | 35,920 | 33,517 |
Capital expenditures | 3,301 | 3,280 |
Income from equity method investees | 7 | 7 | 3
Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | 640 | 902 | 1,256
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 7,515 | 7,462 | 8,596
Power supply cost | 2,028 | 2,011 | 2,909
Maintenance and other operating expenses | 1,621 | 1,674 | 1,658
Depreciation and amortization | 1,239 | 1,178 | 1,125
General taxes | 481 | 446 | 411
Total operating expenses | 6,009 | 6,211 | 7,359
Operating Income | 1,506 | 1,251 | 1,237
Total other income | 226 | 220 | 199
Total interest charges | 520 | 448 | 337
Income (Loss) Before Income Taxes | 1,212 | 1,023 | 1,099
Income tax expense (benefit) | 196 | 169 | 144
Income (Loss) From Continuing Operations | 1,016 | 854 | 955
Other segment items | 56 | 78 | 24
Net Income (Loss) Available to Common Stockholders | 1,072 | 932 | 979
Plant, property, and equipment, gross | 34,911 | 33,105 |
Investments | 64 | 74 |
Total assets | 35,850 | 33,315 |
Capital expenditures | 3,300 | 3,278 |
Operating Segments | Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | 640 | 902 | 1,256
Other Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 0 | 0 | 0
Power supply cost | 0 | 0 | 0
Maintenance and other operating expenses | 17 | 13 | 11
Depreciation and amortization | 1 | 2 | 1
General taxes | 1 | 1 | 1
Total operating expenses | 19 | 16 | 13
Operating Income | (19) | (16) | (13)
Total other income | 118 | 142 | (2)
Total interest charges | 188 | 195 | 182
Income (Loss) Before Income Taxes | (89) | (69) | (197)
Income tax expense (benefit) | (20) | (22) | (51)
Income (Loss) From Continuing Operations | (69) | (47) | (146)
Other segment items | (10) | (8) | (6)
Net Income (Loss) Available to Common Stockholders | (79) | (55) | (152)
Plant, property, and equipment, gross | 21 | 30 |
Investments | 0 | 0 |
Total assets | 70 | 202 |
Capital expenditures | 1 | 2 |
Other Reconciling Items | Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | 0 | 0 | 0
Electric Utility | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 5,061 | 4,745 | 5,419
Power supply cost | 1,867 | 1,841 | 2,605
Maintenance and other operating expenses | 1,066 | 1,075 | 1,028
Depreciation and amortization | 865 | 797 | 757
General taxes | 281 | 260 | 240
Total operating expenses | 4,079 | 3,973 | 4,630
Operating Income | 982 | 772 | 789
Total other income | 126 | 131 | 106
Total interest charges | 324 | 285 | 218
Income (Loss) Before Income Taxes | 784 | 618 | 677
Income tax expense (benefit) | 102 | 67 | 109
Income (Loss) From Continuing Operations | 682 | 551 | 568
Other segment items | (1) | (1) | (1)
Net Income (Loss) Available to Common Stockholders | 681 | 550 | 567
Plant, property, and equipment, gross | 20,137 | 19,302 |
Investments | 0 | 0 |
Total assets | 20,710 | 19,358 |
Capital expenditures | 1,871 | 2,081 |
Electric Utility | Operating Segments | Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | 0 | 0 | 0
Gas Utility | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 2,138 | 2,420 | 2,732
Power supply cost | 0 | 0 | 0
Maintenance and other operating expenses | 454 | 511 | 554
Depreciation and amortization | 325 | 338 | 330
General taxes | 188 | 176 | 159
Total operating expenses | 1,604 | 1,922 | 2,286
Operating Income | 534 | 498 | 446
Total other income | 86 | 77 | 81
Total interest charges | 192 | 161 | 116
Income (Loss) Before Income Taxes | 428 | 414 | 411
Income tax expense (benefit) | 99 | 98 | 32
Income (Loss) From Continuing Operations | 329 | 316 | 379
Other segment items | (1) | (1) | (1)
Net Income (Loss) Available to Common Stockholders | 328 | 315 | 378
Plant, property, and equipment, gross | 13,268 | 12,383 |
Investments | 0 | 0 |
Total assets | 13,247 | 12,353 |
Capital expenditures | 1,141 | 1,041 |
Gas Utility | Operating Segments | Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | 637 | 897 | 1,243
NorthStar Clean Energy | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | 316 | 297 | 445
Power supply cost | 161 | 170 | 304
Maintenance and other operating expenses | 101 | 88 | 76
Depreciation and amortization | 49 | 43 | 38
General taxes | 12 | 10 | 12
Total operating expenses | 326 | 316 | 443
Operating Income | (10) | (19) | 2
Total other income | 14 | 12 | 12
Total interest charges | 4 | 2 | 3
Income (Loss) Before Income Taxes | 0 | (9) | 11
Income tax expense (benefit) | (5) | 4 | 3
Income (Loss) From Continuing Operations | 5 | (13) | 8
Other segment items | 58 | 80 | 26
Net Income (Loss) Available to Common Stockholders | 63 | 67 | 34
Plant, property, and equipment, gross | 1,506 | 1,420 |
Investments | 64 | 74 |
Total assets | 1,893 | 1,604 |
Capital expenditures | 288 | 156 |
NorthStar Clean Energy | Operating Segments | Cost of gas sold |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of gas sold | $ 3 | $ 5 | $ 13

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