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Reportable Segments (Tables) | 12 Months Ended
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Dec. 31, 2012
Reconciliation Of Segments To Consolidated |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 4,031 |  | $ | 3,913 |  | $ | 3,802 |
Gas utility |  |  | 1,982 |  |  | 2,340 |  |  | 2,354 |
Enterprises |  |  | 183 |  |  | 204 |  |  | 238 |
Other |  |  | 57 |  |  | 46 |  |  | 38 |
Total operating revenue – CMS Energy |  | $ | 6,253 |  | $ | 6,503 |  | $ | 6,432 |
Consumers |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 4,031 |  | $ | 3,913 |  | $ | 3,802 |
Gas utility |  |  | 1,982 |  |  | 2,340 |  |  | 2,354 |
Total operating revenue – Consumers |  | $ | 6,013 |  | $ | 6,253 |  | $ | 6,156 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 459 |  | $ | 412 |  | $ | 450 |
Gas utility |  |  | 133 |  |  | 130 |  |  | 122 |
Enterprises |  |  | 4 |  |  | 3 |  |  | 3 |
Other |  |  | 2 |  |  | 1 |  |  | 1 |
Total depreciation and amortization – CMS Energy |  | $ | 598 |  | $ | 546 |  | $ | 576 |
Consumers |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 459 |  | $ | 412 |  | $ | 450 |
Gas utility |  |  | 133 |  |  | 130 |  |  | 122 |
Total depreciation and amortization – Consumers |  | $ | 592 |  | $ | 542 |  | $ | 572 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Income from equity method investees1 |  |  |  |  |  |  |  |  |  |
Enterprises |  | $ | 17 |  | $ | 9 |  | $ | 11 |
Total income from equity method investees – CMS Energy |  | $ | 17 |  | $ | 9 |  | $ | 11 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 179 |  | $ | 192 |  | $ | 202 |
Gas utility |  |  | 63 |  |  | 71 |  |  | 73 |
Other |  |  | 147 |  |  | 152 |  |  | 156 |
Total interest charges – CMS Energy |  | $ | 389 |  | $ | 415 |  | $ | 431 |
Consumers |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 179 |  | $ | 192 |  | $ | 202 |
Gas utility |  |  | 63 |  |  | 71 |  |  | 73 |
Other |  |  | 2 |  |  | 2 |  |  | 2 |
Total interest charges – Consumers |  | $ | 244 |  | $ | 265 |  | $ | 277 |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 227 |  | $ | 190 |  | $ | 187 |
Gas utility |  |  | 70 |  |  | 77 |  |  | 67 |
Enterprises |  |  | (1) |  |  | (24) |  |  | 14 |
Other |  |  | (51) |  |  | (52) |  |  | (44) |
Total income tax expense – CMS Energy |  | $ | 245 |  | $ | 191 |  | $ | 224 |
Consumers |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 227 |  | $ | 190 |  | $ | 187 |
Gas utility |  |  | 70 |  |  | 77 |  |  | 67 |
Total income tax expense – Consumers |  | $ | 297 |  | $ | 267 |  | $ | 254 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 325 |  | $ | 333 |  | $ | 303 |
Gas utility |  |  | 110 |  |  | 130 |  |  | 127 |
Enterprises |  |  | 16 |  |  | 32 |  |  | 36 |
Other |  |  | (69) |  |  | (80) |  |  | (142) |
Total net income available to common stockholders – CMS Energy |  | $ | 382 |  | $ | 415 |  | $ | 324 |
Consumers |  |  |  |  |  |  |  |  |  |
Net income available to common stockholder |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 325 |  | $ | 333 |  | $ | 303 |
Gas utility |  |  | 110 |  |  | 130 |  |  | 127 |
Other |  |  | 2 |  |  | 2 |  |  | 2 |
Total net income available to common stockholder – Consumers |  | $ | 437 |  | $ | 465 |  | $ | 432 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Plant, property, and equipment, gross |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 11,041 |  | $ | 10,400 |  | $ | 9,944 |
Gas utility |  |  | 4,400 |  |  | 4,206 |  |  | 4,063 |
Enterprises |  |  | 113 |  |  | 109 |  |  | 102 |
Other |  |  | 38 |  |  | 36 |  |  | 36 |
Total plant, property, and equipment – CMS Energy |  | $ | 15,592 |  | $ | 14,751 |  | $ | 14,145 |
Consumers |  |  |  |  |  |  |  |  |  |
Plant, property, and equipment, gross |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 11,041 |  | $ | 10,400 |  | $ | 9,944 |
Gas utility |  |  | 4,400 |  |  | 4,206 |  |  | 4,063 |
Other |  |  | 15 |  |  | 15 |  |  | 15 |
Total plant, property, and equipment – Consumers |  | $ | 15,456 |  | $ | 14,621 |  | $ | 14,022 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Investments in equity method investees1 |  |  |  |  |  |  |  |  |  |
Enterprises |  | $ | 55 |  | $ | 49 |  | $ | 48 |
Other |  |  | 2 |  |  | 1 |  |  | 1 |
Total investments in equity method investees – CMS Energy |  | $ | 57 |  | $ | 50 |  | $ | 49 |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |
Electric utility2 |  | $ | 10,423 |  | $ | 9,938 |  | $ | 9,321 |
Gas utility2 |  |  | 5,016 |  |  | 4,956 |  |  | 4,614 |
Enterprises |  |  | 181 |  |  | 242 |  |  | 191 |
Other |  |  | 1,511 |  |  | 1,316 |  |  | 1,490 |
Total assets – CMS Energy |  | $ | 17,131 |  | $ | 16,452 |  | $ | 15,616 |
Consumers |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |
Electric utility2 |  | $ | 10,423 |  | $ | 9,938 |  | $ | 9,321 |
Gas utility2 |  |  | 5,016 |  |  | 4,956 |  |  | 4,614 |
Other |  |  | 836 |  |  | 768 |  |  | 904 |
Total assets – Consumers |  | $ | 16,275 |  | $ | 15,662 |  | $ | 14,839 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Capital expenditures3 |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 921 |  | $ | 661 |  | $ | 642 |
Gas utility |  |  | 340 |  |  | 261 |  |  | 235 |
Enterprises |  |  | 1 |  |  | 5 |  |  | 4 |
Other |  |  | 4 |  |  | 1 |  |  | 2 |
Total capital expenditures – CMS Energy |  | $ | 1,266 |  | $ | 928 |  | $ | 883 |
Consumers |  |  |  |  |  |  |  |  |  |
Capital expenditures3 |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 921 |  | $ | 661 |  | $ | 642 |
Gas utility |  |  | 340 |  |  | 261 |  |  | 235 |
Total capital expenditures – Consumers |  | $ | 1,261 |  | $ | 922 |  | $ | 877 |
1 | Consumers had no significant equity method investments.
2 | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.
3 | 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.
Consumers Energy Company [Member] |
Reconciliation Of Segments To Consolidated |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 4,031 |  | $ | 3,913 |  | $ | 3,802 |
Gas utility |  |  | 1,982 |  |  | 2,340 |  |  | 2,354 |
Enterprises |  |  | 183 |  |  | 204 |  |  | 238 |
Other |  |  | 57 |  |  | 46 |  |  | 38 |
Total operating revenue – CMS Energy |  | $ | 6,253 |  | $ | 6,503 |  | $ | 6,432 |
Consumers |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 4,031 |  | $ | 3,913 |  | $ | 3,802 |
Gas utility |  |  | 1,982 |  |  | 2,340 |  |  | 2,354 |
Total operating revenue – Consumers |  | $ | 6,013 |  | $ | 6,253 |  | $ | 6,156 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 459 |  | $ | 412 |  | $ | 450 |
Gas utility |  |  | 133 |  |  | 130 |  |  | 122 |
Enterprises |  |  | 4 |  |  | 3 |  |  | 3 |
Other |  |  | 2 |  |  | 1 |  |  | 1 |
Total depreciation and amortization – CMS Energy |  | $ | 598 |  | $ | 546 |  | $ | 576 |
Consumers |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 459 |  | $ | 412 |  | $ | 450 |
Gas utility |  |  | 133 |  |  | 130 |  |  | 122 |
Total depreciation and amortization – Consumers |  | $ | 592 |  | $ | 542 |  | $ | 572 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Income from equity method investees1 |  |  |  |  |  |  |  |  |  |
Enterprises |  | $ | 17 |  | $ | 9 |  | $ | 11 |
Total income from equity method investees – CMS Energy |  | $ | 17 |  | $ | 9 |  | $ | 11 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 179 |  | $ | 192 |  | $ | 202 |
Gas utility |  |  | 63 |  |  | 71 |  |  | 73 |
Other |  |  | 147 |  |  | 152 |  |  | 156 |
Total interest charges – CMS Energy |  | $ | 389 |  | $ | 415 |  | $ | 431 |
Consumers |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 179 |  | $ | 192 |  | $ | 202 |
Gas utility |  |  | 63 |  |  | 71 |  |  | 73 |
Other |  |  | 2 |  |  | 2 |  |  | 2 |
Total interest charges – Consumers |  | $ | 244 |  | $ | 265 |  | $ | 277 |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 227 |  | $ | 190 |  | $ | 187 |
Gas utility |  |  | 70 |  |  | 77 |  |  | 67 |
Enterprises |  |  | (1) |  |  | (24) |  |  | 14 |
Other |  |  | (51) |  |  | (52) |  |  | (44) |
Total income tax expense – CMS Energy |  | $ | 245 |  | $ | 191 |  | $ | 224 |
Consumers |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 227 |  | $ | 190 |  | $ | 187 |
Gas utility |  |  | 70 |  |  | 77 |  |  | 67 |
Total income tax expense – Consumers |  | $ | 297 |  | $ | 267 |  | $ | 254 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 325 |  | $ | 333 |  | $ | 303 |
Gas utility |  |  | 110 |  |  | 130 |  |  | 127 |
Enterprises |  |  | 16 |  |  | 32 |  |  | 36 |
Other |  |  | (69) |  |  | (80) |  |  | (142) |
Total net income available to common stockholders – CMS Energy |  | $ | 382 |  | $ | 415 |  | $ | 324 |
Consumers |  |  |  |  |  |  |  |  |  |
Net income available to common stockholder |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 325 |  | $ | 333 |  | $ | 303 |
Gas utility |  |  | 110 |  |  | 130 |  |  | 127 |
Other |  |  | 2 |  |  | 2 |  |  | 2 |
Total net income available to common stockholder – Consumers |  | $ | 437 |  | $ | 465 |  | $ | 432 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Plant, property, and equipment, gross |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 11,041 |  | $ | 10,400 |  | $ | 9,944 |
Gas utility |  |  | 4,400 |  |  | 4,206 |  |  | 4,063 |
Enterprises |  |  | 113 |  |  | 109 |  |  | 102 |
Other |  |  | 38 |  |  | 36 |  |  | 36 |
Total plant, property, and equipment – CMS Energy |  | $ | 15,592 |  | $ | 14,751 |  | $ | 14,145 |
Consumers |  |  |  |  |  |  |  |  |  |
Plant, property, and equipment, gross |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 11,041 |  | $ | 10,400 |  | $ | 9,944 |
Gas utility |  |  | 4,400 |  |  | 4,206 |  |  | 4,063 |
Other |  |  | 15 |  |  | 15 |  |  | 15 |
Total plant, property, and equipment – Consumers |  | $ | 15,456 |  | $ | 14,621 |  | $ | 14,022 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Investments in equity method investees1 |  |  |  |  |  |  |  |  |  |
Enterprises |  | $ | 55 |  | $ | 49 |  | $ | 48 |
Other |  |  | 2 |  |  | 1 |  |  | 1 |
Total investments in equity method investees – CMS Energy |  | $ | 57 |  | $ | 50 |  | $ | 49 |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |
Electric utility2 |  | $ | 10,423 |  | $ | 9,938 |  | $ | 9,321 |
Gas utility2 |  |  | 5,016 |  |  | 4,956 |  |  | 4,614 |
Enterprises |  |  | 181 |  |  | 242 |  |  | 191 |
Other |  |  | 1,511 |  |  | 1,316 |  |  | 1,490 |
Total assets – CMS Energy |  | $ | 17,131 |  | $ | 16,452 |  | $ | 15,616 |
Consumers |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |
Electric utility2 |  | $ | 10,423 |  | $ | 9,938 |  | $ | 9,321 |
Gas utility2 |  |  | 5,016 |  |  | 4,956 |  |  | 4,614 |
Other |  |  | 836 |  |  | 768 |  |  | 904 |
Total assets – Consumers |  | $ | 16,275 |  | $ | 15,662 |  | $ | 14,839 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Capital expenditures3 |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 921 |  | $ | 661 |  | $ | 642 |
Gas utility |  |  | 340 |  |  | 261 |  |  | 235 |
Enterprises |  |  | 1 |  |  | 5 |  |  | 4 |
Other |  |  | 4 |  |  | 1 |  |  | 2 |
Total capital expenditures – CMS Energy |  | $ | 1,266 |  | $ | 928 |  | $ | 883 |
Consumers |  |  |  |  |  |  |  |  |  |
Capital expenditures3 |  |  |  |  |  |  |  |  |  |
Electric utility |  | $ | 921 |  | $ | 661 |  | $ | 642 |
Gas utility |  |  | 340 |  |  | 261 |  |  | 235 |
Total capital expenditures – Consumers |  | $ | 1,261 |  | $ | 922 |  | $ | 877 |
1 | Consumers had no significant equity method investments.
2 | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.
3 | 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.

X
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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