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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 1,736 |  | $ 1,445 | $ 1,406 | $ 1,979 | $ 1,670 |  | $ 1,507 | $ 1,333 | $ 1,743 | $ 6,566 |  | $ 6,253 |  | $ 6,503 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 628 |  | 598 |  | 546 |
Income (loss) from equity method investees |  |  |  |  |  |  |  |  |  |  | 13 | [1] | 17 | [1] | 9 | [1]
Interest charges |  |  |  |  |  |  |  |  |  |  | 398 |  | 389 |  | 415 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 302 |  | 245 |  | 191 |
Total Net Income Available to Common Stockholders | 102 |  | 126 | 80 | 144 | 67 |  | 148 | 100 | 67 | 452 |  | 382 |  | 415 |
Plant, property, and equipment, gross | 16,184 |  |  |  |  | 15,592 |  |  |  |  | 16,184 |  | 15,592 |  | 14,751 |
Investments in equity method investees | 59 | [1] |  |  |  | 57 | [1] |  |  |  | 59 | [1] | 57 | [1] | 50 | [1]
Total Assets | 17,416 |  |  |  |  | 17,131 |  |  |  |  | 17,416 |  | 17,131 |  | 16,452 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 1,408 | [2] | 1,266 | [2] | 928 | [2]
Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 1,674 |  | 1,386 | 1,342 | 1,919 | 1,608 |  | 1,448 | 1,282 | 1,675 | 6,321 |  | 6,013 |  | 6,253 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 622 |  | 592 |  | 542 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 245 |  | 244 |  | 265 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 346 |  | 297 |  | 267 |
Total Net Income Available to Common Stockholders | 119 |  | 152 | 99 | 162 | 78 |  | 162 | 121 | 76 | 532 |  | 437 |  | 465 |
Plant, property, and equipment, gross | 16,044 |  |  |  |  | 15,456 |  |  |  |  | 16,044 |  | 15,456 |  | 14,621 |
Total Assets | 16,179 |  |  |  |  | 16,275 |  |  |  |  | 16,179 |  | 16,275 |  | 15,662 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 1,403 | [2] | 1,261 | [2] | 922 | [2]
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 4,173 |  | 4,031 |  | 3,913 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 484 |  | 459 |  | 412 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 179 |  | 179 |  | 192 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 242 |  | 227 |  | 190 |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 363 |  | 325 |  | 333 |
Plant, property, and equipment, gross | 11,186 |  |  |  |  | 11,041 |  |  |  |  | 11,186 |  | 11,041 |  | 10,400 |
Total Assets | 10,487 | [3] |  |  |  | 10,423 | [3] |  |  |  | 10,487 | [3] | 10,423 | [3] | 9,938 | [3]
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 996 | [2] | 921 | [2] | 661 | [2]
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 4,173 |  | 4,031 |  | 3,913 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 484 |  | 459 |  | 412 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 179 |  | 179 |  | 192 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 242 |  | 227 |  | 190 |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 363 |  | 325 |  | 333 |
Plant, property, and equipment, gross | 11,186 |  |  |  |  | 11,041 |  |  |  |  | 11,186 |  | 11,041 |  | 10,400 |
Total Assets | 10,487 | [3] |  |  |  | 10,423 | [3] |  |  |  | 10,487 | [3] | 10,423 | [3] | 9,938 | [3]
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 996 | [2] | 921 | [2] | 661 | [2]
Gas Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 2,148 |  | 1,982 |  | 2,340 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 138 |  | 133 |  | 130 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 64 |  | 63 |  | 71 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 104 |  | 70 |  | 77 |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 168 |  | 110 |  | 130 |
Plant, property, and equipment, gross | 4,843 |  |  |  |  | 4,400 |  |  |  |  | 4,843 |  | 4,400 |  | 4,206 |
Total Assets | 4,784 | [3] |  |  |  | 5,016 | [3] |  |  |  | 4,784 | [3] | 5,016 | [3] | 4,956 | [3]
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 407 | [2] | 340 | [2] | 261 | [2]
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 2,148 |  | 1,982 |  | 2,340 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 138 |  | 133 |  | 130 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 64 |  | 63 |  | 71 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 104 |  | 70 |  | 77 |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 168 |  | 110 |  | 130 |
Plant, property, and equipment, gross | 4,843 |  |  |  |  | 4,400 |  |  |  |  | 4,843 |  | 4,400 |  | 4,206 |
Total Assets | 4,784 | [3] |  |  |  | 5,016 | [3] |  |  |  | 4,784 | [3] | 5,016 | [3] | 4,956 | [3]
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 407 | [2] | 340 | [2] | 261 | [2]
Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 181 |  | 183 |  | 204 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 3 |  | 4 |  | 3 |
Income (loss) from equity method investees |  |  |  |  |  |  |  |  |  |  | 13 | [1] | 17 | [1] | 9 | [1]
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | (4) |  | (1) |  | (24) |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 2 |  | 16 |  | 32 |
Plant, property, and equipment, gross | 115 |  |  |  |  | 113 |  |  |  |  | 115 |  | 113 |  | 109 |
Investments in equity method investees | 57 | [1] |  |  |  | 55 | [1] |  |  |  | 57 | [1] | 55 | [1] | 49 | [1]
Total Assets | 332 |  |  |  |  | 181 |  |  |  |  | 332 |  | 181 |  | 242 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 1 | [2] | 1 | [2] | 5 | [2]
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 64 |  | 57 |  | 46 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 3 |  | 2 |  | 1 |
Interest charges |  |  |  |  |  |  |  |  |  |  | 155 |  | 147 |  | 152 |
Income Tax Expense |  |  |  |  |  |  |  |  |  |  | (40) |  | (51) |  | (52) |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | (81) |  | (69) |  | (80) |
Plant, property, and equipment, gross | 40 |  |  |  |  | 38 |  |  |  |  | 40 |  | 38 |  | 36 |
Investments in equity method investees | 2 | [1] |  |  |  | 2 | [1] |  |  |  | 2 | [1] | 2 | [1] | 1 | [1]
Total Assets | 1,813 |  |  |  |  | 1,511 |  |  |  |  | 1,813 |  | 1,511 |  | 1,316 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 4 | [2] | 4 | [2] | 1 | [2]
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  | 2 |
Total Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  |  |  | 1 |  | 2 |  | 2 |
Plant, property, and equipment, gross | 15 |  |  |  |  | 15 |  |  |  |  | 15 |  | 15 |  | 15 |
Total Assets | $ 908 |  |  |  |  | $ 836 |  |  |  |  | $ 908 |  | $ 836 |  | $ 768 |
[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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