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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 1,640 | $ 1,587 | $ 1,371 | $ 1,801 | $ 1,509 | $ 1,486 | $ 1,350 | $ 2,111 | $ 6,399 | $ 6,456 | $ 7,179
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 811 | 750 | 685
Income from equity method investees | [1] |  |  |  |  |  |  |  |  | 13 | 14 | 15
Interest charges |  |  |  |  |  |  |  |  |  | 435 | 396 | 407
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 273 | 271 | 250
Net Income Attributable to CMS Energy |  | 77 | 186 | 124 | 164 | 106 | 148 | 67 | 202 | 551 | 523 | 477
Plant, property, and equipment, gross |  | 21,010 |  |  |  | 18,943 |  |  |  | 21,010 | 18,943 | 17,721
Investments in equity method investees | [1] | 65 |  |  |  | 64 |  |  |  | 65 | 64 | 61
Total Assets |  | 21,622 |  |  |  | 20,299 |  |  |  | 21,622 | 20,299 | 19,143
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,633 | 1,741 | 1,616
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | 1,550 | 1,498 | 1,293 | 1,723 | 1,439 | 1,417 | 1,281 | 2,028 | 6,064 | 6,165 | 6,800
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 803 | 744 | 678
Interest charges |  |  |  |  |  |  |  |  |  | 268 | 250 | 250
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 320 | 302 | 306
Net income (loss) available to common stockholder |  | 116 | $ 195 | $ 131 | $ 172 | 134 | $ 160 | $ 83 | $ 215 | 614 | 592 | 565
Plant, property, and equipment, gross |  | 20,838 |  |  |  | 18,797 |  |  |  | 20,838 | 18,797 | 17,580
Total Assets |  | 19,946 |  |  |  | 18,635 |  |  |  | 19,946 | 18,635 | 17,824
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,618 | 1,694 | 1,612
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 4,379 | 4,249 | 4,436
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 603 | 567 | 522
Interest charges |  |  |  |  |  |  |  |  |  | 196 | 178 | 181
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 246 | 224 | 211
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 458 | 437 | 384
Plant, property, and equipment, gross |  | 14,540 |  |  |  | 13,059 |  |  |  | 14,540 | 13,059 | 12,230
Total Assets | [3] | 13,429 |  |  |  | 12,660 |  |  |  | 13,429 | 12,660 | 11,565
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,007 | 1,136 | 1,139
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 4,379 | 4,249 | 4,436
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 603 | 567 | 522
Interest charges |  |  |  |  |  |  |  |  |  | 196 | 178 | 181
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 246 | 224 | 211
Net income (loss) available to common stockholder |  |  |  |  |  |  |  |  |  | 458 | 437 | 384
Plant, property, and equipment, gross |  | 14,540 |  |  |  | 13,059 |  |  |  | 14,540 | 13,059 | 12,230
Total Assets | [3] | 13,430 |  |  |  | 12,660 |  |  |  | 13,430 | 12,660 | 11,565
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 1,007 | 1,136 | 1,139
Gas Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 1,685 | 1,916 | 2,363
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 200 | 177 | 156
Interest charges |  |  |  |  |  |  |  |  |  | 72 | 71 | 67
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 74 | 78 | 95
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 155 | 154 | 179
Plant, property, and equipment, gross |  | 6,283 |  |  |  | 5,723 |  |  |  | 6,283 | 5,723 | 5,335
Total Assets | [3] | 6,446 |  |  |  | 5,912 |  |  |  | 6,446 | 5,912 | 5,385
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 611 | 558 | 473
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 1,685 | 1,916 | 2,363
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 200 | 177 | 156
Interest charges |  |  |  |  |  |  |  |  |  | 72 | 71 | 67
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 74 | 78 | 95
Net income (loss) available to common stockholder |  |  |  |  |  |  |  |  |  | 155 | 154 | 179
Plant, property, and equipment, gross |  | 6,283 |  |  |  | 5,723 |  |  |  | 6,283 | 5,723 | 5,335
Total Assets | [3] | 6,446 |  |  |  | 5,912 |  |  |  | 6,446 | 5,912 | 5,385
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 611 | 558 | 473
Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 215 | 190 | 299
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 5 | 4 | 4
Income from equity method investees | [1] |  |  |  |  |  |  |  |  | 13 | 14 | 15
Interest charges |  |  |  |  |  |  |  |  |  | 1 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 10 | 3 | (1)
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | 17 | 4 | (1)
Plant, property, and equipment, gross |  | 157 |  |  |  | 120 |  |  |  | 157 | 120 | 115
Investments in equity method investees | [1] | 62 |  |  |  | 61 |  |  |  | 62 | 61 | 58
Total Assets |  | 269 |  |  |  | 270 |  |  |  | 269 | 270 | 231
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 10 | 44 | 3
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 120 | 101 | 81
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3 | 2 | 3
Interest charges |  |  |  |  |  |  |  |  |  | 166 | 147 | 159
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (57) | (34) | (55)
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  | (79) | (72) | (85)
Plant, property, and equipment, gross |  | 30 |  |  |  | 41 |  |  |  | 30 | 41 | 41
Investments in equity method investees | [1] | 3 |  |  |  | 3 |  |  |  | 3 | 3 | 3
Total Assets |  | 1,478 |  |  |  | 1,457 |  |  |  | 1,478 | 1,457 | 1,962
Capital expenditures | [2] |  |  |  |  |  |  |  |  | 5 | 3 | 1
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 1
Interest charges |  |  |  |  |  |  |  |  |  |  | 1 | 2
Net income (loss) available to common stockholder |  |  |  |  |  |  |  |  |  | 1 | 1 | 2
Plant, property, and equipment, gross |  | 15 |  |  |  | 15 |  |  |  | 15 | 15 | 15
Total Assets |  | $ 70 |  |  |  | $ 63 |  |  |  | $ 70 | $ 63 | $ 874
[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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