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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | $ 1,829 | $ 1,801 |
Net income available to common stockholders |  | 199 | 164 |
Plant, property, and equipment, gross |  | 21,265 |  | $ 21,010
Total Assets |  | 21,623 |  | 21,622
Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,737 | 1,723 |
Net income available to common stockholders |  | 211 | 172 |
Plant, property, and equipment, gross |  | 21,092 |  | 20,838
Total Assets |  | 19,824 |  | 19,946
Electric Utility [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,036 | 1,013 |
Net income available to common stockholders |  | 124 | 91 |
Plant, property, and equipment, gross | [1] | 14,715 |  | 14,540
Total Assets | [1] | 13,653 |  | 13,429
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,036 | 1,013 |
Net income available to common stockholders |  | 124 | 91 |
Plant, property, and equipment, gross | [1] | 14,715 |  | 14,540
Total Assets | [1] | 13,656 |  | 13,430
Gas Utility [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 701 | 710 |
Net income available to common stockholders |  | 87 | 81 |
Plant, property, and equipment, gross | [1] | 6,362 |  | 6,283
Total Assets | [1] | 6,131 |  | 6,446
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 701 | 710 |
Net income available to common stockholders |  | 87 | 81 |
Plant, property, and equipment, gross | [1] | 6,362 |  | 6,283
Total Assets | [1] | 6,131 |  | 6,446
Enterprises [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 59 | 48 |
Net income available to common stockholders |  | 12 | 6 |
Plant, property, and equipment, gross |  | 158 |  | 157
Total Assets |  | 269 |  | 269
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 33 | 30 |
Net income available to common stockholders |  | (24) | $ (14) |
Plant, property, and equipment, gross |  | 30 |  | 30
Total Assets |  | 1,570 |  | 1,478
Other [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Plant, property, and equipment, gross |  | 15 |  | 15
Total Assets |  | $ 37 |  | $ 70
[1] | Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.

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