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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 1,509 | $ 1,486 | $ 1,350 | $ 2,111 | $ 1,758 | $ 1,430 | $ 1,468 | $ 2,523 | $ 6,456 | $ 7,179 | $ 6,566
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 750 | 685 | 628
Income (loss) from equity method investees | [1] |  |  |  |  |  |  |  |  | 14 | 15 | 13
Interest charges |  |  |  |  |  |  |  |  |  | 396 | 407 | 398
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 271 | 250 | 302
Net Income Attributable to CMS Energy |  | 106 | 148 | 67 | 202 | 96 | 94 | 83 | 204 | 523 | 477 | 452
Plant, property, and equipment, gross |  | 18,943 |  |  |  | 17,721 |  |  |  | 18,943 | 17,721 | 16,184
Investments in equity method investees | [1] | 64 |  |  |  | 61 |  |  |  | 64 | 61 | 59
Total Assets |  | 20,340 |  |  |  | 19,185 |  |  |  | 20,340 | 19,185 | 17,290
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,741 | 1,616 | 1,408
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | 1,439 | 1,417 | 1,281 | 2,028 | 1,672 | 1,359 | 1,387 | 2,382 | 6,165 | 6,800 | 6,321
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 744 | 678 | 622
Interest charges |  |  |  |  |  |  |  |  |  | 250 | 250 | 245
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 302 | 306 | 346
Net Income Available to Common Stockholders |  | 134 | $ 160 | $ 83 | $ 215 | 117 | $ 119 | $ 108 | $ 221 | 592 | 565 | 532
Plant, property, and equipment, gross |  | 18,797 |  |  |  | 17,580 |  |  |  | 18,797 | 17,580 | 16,044
Total Assets |  | 18,658 |  |  |  | 17,847 |  |  |  | 18,658 | 17,847 | 16,179
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,694 | 1,612 | 1,403
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 4,249 | 4,436 | 4,173
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 567 | 522 | 484
Interest charges |  |  |  |  |  |  |  |  |  | 178 | 181 | 179
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 224 | 211 | 242
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 437 | 384 | 363
Plant, property, and equipment, gross |  | 13,059 |  |  |  | 12,230 |  |  |  | 13,059 | 12,230 | 11,186
Total Assets | [3] | 12,676 |  |  |  | 11,582 |  |  |  | 12,676 | 11,582 | 10,487
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,136 | 1,139 | 996
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 4,249 | 4,436 | 4,173
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 567 | 522 | 484
Interest charges |  |  |  |  |  |  |  |  |  | 178 | 181 | 179
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 224 | 211 | 242
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  | 437 | 384 | 363
Plant, property, and equipment, gross |  | 13,059 |  |  |  | 12,230 |  |  |  | 13,059 | 12,230 | 11,186
Total Assets | [3] | 12,676 |  |  |  | 11,582 |  |  |  | 12,676 | 11,582 | 10,487
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,136 | 1,139 | 996
Gas Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 1,916 | 2,363 | 2,148
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 177 | 156 | 138
Interest charges |  |  |  |  |  |  |  |  |  | 71 | 67 | 64
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 78 | 95 | 104
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 154 | 179 | 168
Plant, property, and equipment, gross |  | 5,723 |  |  |  | 5,335 |  |  |  | 5,723 | 5,335 | 4,843
Total Assets | [3] | 5,918 |  |  |  | 5,391 |  |  |  | 5,918 | 5,391 | 4,784
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 558 | 473 | 407
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 1,916 | 2,363 | 2,148
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 177 | 156 | 138
Interest charges |  |  |  |  |  |  |  |  |  | 71 | 67 | 64
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 78 | 95 | 104
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  | 154 | 179 | 168
Plant, property, and equipment, gross |  | 5,723 |  |  |  | 5,335 |  |  |  | 5,723 | 5,335 | 4,843
Total Assets | [3] | 5,918 |  |  |  | 5,391 |  |  |  | 5,918 | 5,391 | 4,784
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 558 | 473 | 407
Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 190 | 299 | 181
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 4 | 4 | 3
Income (loss) from equity method investees | [1] |  |  |  |  |  |  |  |  | 14 | 15 | 13
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 3 | (1) | (4)
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 4 | (1) | 2
Plant, property, and equipment, gross |  | 120 |  |  |  | 115 |  |  |  | 120 | 115 | 115
Investments in equity method investees | [1] | 61 |  |  |  | 58 |  |  |  | 61 | 58 | 57
Total Assets |  | 270 |  |  |  | 231 |  |  |  | 270 | 231 | 231
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 44 | 3 | 1
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 101 | 81 | 64
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2 | 3 | 3
Interest charges |  |  |  |  |  |  |  |  |  | 147 | 159 | 155
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (34) | (55) | (40)
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | (72) | (85) | (81)
Plant, property, and equipment, gross |  | 41 |  |  |  | 41 |  |  |  | 41 | 41 | 40
Investments in equity method investees | [1] | 3 |  |  |  | 3 |  |  |  | 3 | 3 | 2
Total Assets |  | 1,476 |  |  |  | 1,981 |  |  |  | 1,476 | 1,981 | 1,788
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 3 | 1 | 4
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 1 |
Interest charges |  |  |  |  |  |  |  |  |  | 1 | 2 | 2
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  | 1 | 2 | 1
Plant, property, and equipment, gross |  | 15 |  |  |  | 15 |  |  |  | 15 | 15 | 15
Total Assets |  | $ 64 |  |  |  | $ 874 |  |  |  | $ 64 | $ 874 | $ 908
[1] | Consumers had no significant equity method investments.
[2] | Amounts include purchase of capital lease additions. Amounts also include a portion of Consumers' capital expenditures for plant and equipment attributable to both the electric and gas utility businesses.
[3] | Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.

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