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Reportable Segments (Schedule of Financial Information by Reportable Segments, CMS Energy, including Consumers) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | $ 1,838 | $ 1,607 | $ 4,285 | $ 3,783 |
Power supply cost | 603 | 479 | 1,218 | 967 |
Maintenance and other operating expenses | 397 | 404 | 802 | 806 |
Depreciation and amortization | 288 | 273 | 676 | 641 |
General taxes | 109 | 102 | 271 | 257 |
Total operating expenses | 1,521 | 1,324 | 3,474 | 3,088 |
Operating Income | 317 | 283 | 811 | 695 |
Total other income | 137 | 113 | 187 | 199 |
Total interest charges | 199 | 173 | 385 | 350 |
Income (Loss) Before Income Taxes | 255 | 223 | 613 | 544 |
Income tax expense (benefit) | 62 | 41 | 125 | 99 |
Income (Loss) From Continuing Operations | 193 | 182 | 488 | 445 |
Other segment items | 5 | 13 | 12 | 35 |
Net Income (Loss) Available to Common Stockholders | 198 | 195 | 500 | 480 |
Plant, property, and equipment, gross | 35,962 | 33,680 | 35,962 | 33,680 | $ 34,932
Total assets | 37,699 | 34,355 | 37,699 | 34,355 | $ 35,920
Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | 124 | 66 | 507 | 417 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,838 | 1,607 | 4,285 | 3,783 |
Power supply cost | 603 | 479 | 1,218 | 967 |
Maintenance and other operating expenses | 394 | 401 | 797 | 801 |
Depreciation and amortization | 288 | 273 | 676 | 640 |
General taxes | 109 | 102 | 271 | 257 |
Total operating expenses | 1,518 | 1,321 | 3,469 | 3,082 |
Operating Income | 320 | 286 | 816 | 701 |
Total other income | 61 | 61 | 108 | 123 |
Total interest charges | 139 | 125 | 269 | 255 |
Income (Loss) Before Income Taxes | 242 | 222 | 655 | 569 |
Income tax expense (benefit) | 36 | 37 | 139 | 111 |
Income (Loss) From Continuing Operations | 206 | 185 | 516 | 458 |
Other segment items | 8 | 16 | 17 | 40 |
Net Income (Loss) Available to Common Stockholders | 214 | 201 | 533 | 498 |
Plant, property, and equipment, gross | 35,932 | 33,659 | 35,932 | 33,659 |
Total assets | 37,435 | 34,250 | 37,435 | 34,250 |
Operating Segments | Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | 124 | 66 | 507 | 417 |
Other Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 0 | 0 | 0 | 0 |
Power supply cost | 0 | 0 | 0 | 0 |
Maintenance and other operating expenses | 3 | 3 | 5 | 5 |
Depreciation and amortization | 0 | 0 | 0 | 1 |
General taxes | 0 | 0 | 0 | 0 |
Total operating expenses | 3 | 3 | 5 | 6 |
Operating Income | (3) | (3) | (5) | (6) |
Total other income | 76 | 52 | 79 | 76 |
Total interest charges | 60 | 48 | 116 | 95 |
Income (Loss) Before Income Taxes | 13 | 1 | (42) | (25) |
Income tax expense (benefit) | 26 | 4 | (14) | (12) |
Income (Loss) From Continuing Operations | (13) | (3) | (28) | (13) |
Other segment items | (3) | (3) | (5) | (5) |
Net Income (Loss) Available to Common Stockholders | (16) | (6) | (33) | (18) |
Plant, property, and equipment, gross | 30 | 21 | 30 | 21 |
Total assets | 264 | 105 | 264 | 105 |
Other Reconciling Items | Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | 0 | 0 | 0 | 0 |
Electric Utility | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,359 | 1,226 | 2,658 | 2,358 |
Power supply cost | 537 | 444 | 1,083 | 893 |
Maintenance and other operating expenses | 264 | 261 | 521 | 499 |
Depreciation and amortization | 222 | 209 | 443 | 422 |
General taxes | 73 | 68 | 146 | 139 |
Total operating expenses | 1,096 | 982 | 2,193 | 1,953 |
Operating Income | 263 | 244 | 465 | 405 |
Total other income | 36 | 36 | 63 | 70 |
Total interest charges | 89 | 79 | 171 | 160 |
Income (Loss) Before Income Taxes | 210 | 201 | 357 | 315 |
Income tax expense (benefit) | 42 | 30 | 65 | 47 |
Income (Loss) From Continuing Operations | 168 | 171 | 292 | 268 |
Other segment items | (1) | (1) | (1) | (1) |
Net Income (Loss) Available to Common Stockholders | 167 | 170 | 291 | 267 |
Plant, property, and equipment, gross | 20,761 | 19,557 | 20,761 | 19,557 |
Total assets | 21,942 | 20,122 | 21,942 | 20,122 |
Electric Utility | Operating Segments | Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | 0 | 0 | 0 | 0 |
Gas Utility | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 387 | 307 | 1,436 | 1,272 |
Power supply cost | 0 | 0 | 0 | 0 |
Maintenance and other operating expenses | 112 | 116 | 228 | 256 |
Depreciation and amortization | 54 | 51 | 208 | 194 |
General taxes | 33 | 31 | 119 | 112 |
Total operating expenses | 322 | 264 | 1,060 | 978 |
Operating Income | 65 | 43 | 376 | 294 |
Total other income | 23 | 23 | 42 | 45 |
Total interest charges | 51 | 46 | 99 | 94 |
Income (Loss) Before Income Taxes | 37 | 20 | 319 | 245 |
Income tax expense (benefit) | 12 | 5 | 81 | 61 |
Income (Loss) From Continuing Operations | 25 | 15 | 238 | 184 |
Other segment items | 0 | 0 | 0 | 0 |
Net Income (Loss) Available to Common Stockholders | 25 | 15 | 238 | 184 |
Plant, property, and equipment, gross | 13,609 | 12,638 | 13,609 | 12,638 |
Total assets | 13,388 | 12,469 | 13,388 | 12,469 |
Gas Utility | Operating Segments | Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | 123 | 66 | 505 | 416 |
NorthStar Clean Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 92 | 74 | 191 | 153 |
Power supply cost | 66 | 35 | 135 | 74 |
Maintenance and other operating expenses | 18 | 24 | 48 | 46 |
Depreciation and amortization | 12 | 13 | 25 | 24 |
General taxes | 3 | 3 | 6 | 6 |
Total operating expenses | 100 | 75 | 216 | 151 |
Operating Income | (8) | (1) | (25) | 2 |
Total other income | 2 | 2 | 3 | 8 |
Total interest charges | (1) | 0 | (1) | 1 |
Income (Loss) Before Income Taxes | (5) | 1 | (21) | 9 |
Income tax expense (benefit) | (18) | 2 | (7) | 3 |
Income (Loss) From Continuing Operations | 13 | (1) | (14) | 6 |
Other segment items | 9 | 17 | 18 | 41 |
Net Income (Loss) Available to Common Stockholders | 22 | 16 | 4 | 47 |
Plant, property, and equipment, gross | 1,562 | 1,464 | 1,562 | 1,464 |
Total assets | 2,105 | 1,659 | 2,105 | 1,659 |
NorthStar Clean Energy | Operating Segments | Cost of gas sold |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost of gas sold | $ 1 | $ 0 | $ 2 | $ 1 |

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