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Consolidated Statements of Income (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Operating Revenue | $ 6,503,000,000 |  | $ 6,432,000,000 |  | $ 6,205,000,000 |
Operating Expenses |  |  |  |  |  |
Fuel for electric generation | 636,000,000 |  | 604,000,000 |  | 541,000,000 |
Purchased and interchange power | 1,282,000,000 |  | 1,239,000,000 |  | 1,163,000,000 |
Purchased power - related parties | 82,000,000 |  | 85,000,000 |  |  |
Cost of gas sold | 1,512,000,000 |  | 1,590,000,000 |  | 1,866,000,000 |
Maintenance and other operating expenses | 1,237,000,000 |  | 1,206,000,000 |  | 1,163,000,000 |
Depreciation and amortization | 546,000,000 |  | 576,000,000 |  | 570,000,000 |
General taxes | 205,000,000 |  | 210,000,000 |  | 217,000,000 |
Insurance settlement | 0 |  | (50,000,000) |  |  |
Gain on asset sales, net | 0 |  | (6,000,000) |  | (13,000,000) |
Total operating expenses | 5,500,000,000 |  | 5,454,000,000 |  | 5,507,000,000 |
Operating Income | 1,003,000,000 |  | 978,000,000 |  | 698,000,000 |
Other Income (Expense) |  |  |  |  |  |
Interest income | 9,000,000 |  | 19,000,000 |  | 18,000,000 |
Allowance for equity funds used during construction | 6,000,000 |  | 5,000,000 |  | 6,000,000 |
Income (loss) from equity method investees | 9,000,000 | [1] | 11,000,000 | [1] | (2,000,000) | [1]
Other income | 16,000,000 |  | 32,000,000 |  | 80,000,000 |
Other expense | (22,000,000) |  | (24,000,000) |  | (30,000,000) |
Total other income | 18,000,000 |  | 43,000,000 |  | 72,000,000 |
Interest Charges |  |  |  |  |  |
Interest on long-term debt | 396,000,000 |  | 394,000,000 |  | 383,000,000 |
Other interest expense | 23,000,000 |  | 40,000,000 |  | 56,000,000 |
Allowance for borrowed funds used during construction | (4,000,000) |  | (3,000,000) |  | (4,000,000) |
Total interest charges | 415,000,000 |  | 431,000,000 |  | 435,000,000 |
Income Before Income Taxes | 606,000,000 |  | 590,000,000 |  | 335,000,000 |
Income Tax Expense | 191,000,000 |  | 224,000,000 |  | 115,000,000 |
Income from Continuing Operations | 415,000,000 |  | 366,000,000 |  | 220,000,000 |
Income (Loss) From Discontinued Operations, Net of Tax | 2,000,000 | [2] | (23,000,000) | [3] | 20,000,000 | [4]
Net Income | 417,000,000 |  | 343,000,000 |  | 240,000,000 |
Income Attributable to Noncontrolling Interests | 2,000,000 |  | 3,000,000 |  | 11,000,000 |
Net Income Attributable to CMS Energy | 415,000,000 |  | 340,000,000 |  | 229,000,000 |
Charge for Deferred Issuance Costs on Preferred Stock | 0 |  | 8,000,000 |  | 0 |
Preferred Stock Dividends | 0 |  | 8,000,000 |  | 11,000,000 |
Net Income Available to Common Stockholders | 415,000,000 |  | 324,000,000 |  | 218,000,000 |
Net Income Attributable to Common Stockholders |  |  |  |  |  |
Amounts Attributable to Continuing Operations | 413,000,000 |  | 347,000,000 |  | 198,000,000 |
Amounts Attributable to Discontinued Operations | 2,000,000 |  | (23,000,000) |  | 20,000,000 |
Net Income Available to Common Stockholders | 415,000,000 |  | 324,000,000 |  | 218,000,000 |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |
Amounts Attributable to Continuing Operations | 2,000,000 |  | 3,000,000 |  | 11,000,000 |
Loss from Discontinued Operations | 0 |  |  |  |  |
Income Attributable to Noncontrolling Interests | 2,000,000 |  | 3,000,000 |  | 11,000,000 |
Basic Earnings Per Average Common Share |  |  |  |  |  |
Basic Earnings from Continuing Operations | $ 1.65 |  | $ 1.50 |  | $ 0.87 |
Basic Earnings (Loss) from Discontinued Operations | $ 0.01 |  | $ (0.10) |  | $ 0.09 |
Basic Earnings Attributable to Common Stock | $ 1.66 |  | $ 1.40 |  | $ 0.96 |
Diluted Earnings Per Average Common Share |  |  |  |  |  |
Diluted Earnings from Continuing Operations | $ 1.57 |  | $ 1.36 |  | $ 0.83 |
Diluted Earnings (Loss) from Discontinued Operations | $ 0.01 |  | $ (0.08) |  | $ 0.08 |
Diluted Earnings Attributable to Common Stock | $ 1.58 |  | $ 1.28 |  | $ 0.91 |
Dividends Declared Per Common Share | $ 0.84 |  | $ 0.66 |  | $ 0.5 |
Consumers Energy Company [Member] |  |  |  |  |  |
Operating Revenue | 6,253,000,000 |  | 6,156,000,000 |  | 5,963,000,000 |
Operating Expenses |  |  |  |  |  |
Fuel for electric generation | 559,000,000 |  | 520,000,000 |  | 460,000,000 |
Purchased and interchange power | 1,267,000,000 |  | 1,224,000,000 |  | 1,151,000,000 |
Purchased power - related parties | 81,000,000 |  | 84,000,000 |  | 81,000,000 |
Cost of gas sold | 1,438,000,000 |  | 1,516,000,000 |  | 1,778,000,000 |
Maintenance and other operating expenses | 1,175,000,000 |  | 1,109,000,000 |  | 1,045,000,000 |
Depreciation and amortization | 542,000,000 |  | 572,000,000 |  | 559,000,000 |
General taxes | 206,000,000 |  | 205,000,000 |  | 209,000,000 |
Gain on asset sales, net | 0 |  |  |  | (9,000,000) |
Total operating expenses | 5,268,000,000 |  | 5,230,000,000 |  | 5,274,000,000 |
Operating Income | 985,000,000 |  | 926,000,000 |  | 689,000,000 |
Other Income (Expense) |  |  |  |  |  |
Interest income | 7,000,000 |  | 18,000,000 |  | 17,000,000 |
Interest and dividend income - related parties | 2,000,000 |  |  |  |  |
Allowance for equity funds used during construction | 6,000,000 |  | 5,000,000 |  | 6,000,000 |
Other income | 19,000,000 |  | 31,000,000 |  | 47,000,000 |
Other expense | (20,000,000) |  | (15,000,000) |  | (11,000,000) |
Total other income | 14,000,000 |  | 39,000,000 |  | 59,000,000 |
Interest Charges |  |  |  |  |  |
Interest on long-term debt | 251,000,000 |  | 246,000,000 |  | 250,000,000 |
Other interest expense | 18,000,000 |  | 34,000,000 |  | 46,000,000 |
Allowance for borrowed funds used during construction | (4,000,000) |  | (3,000,000) |  | (4,000,000) |
Total interest charges | 265,000,000 |  | 277,000,000 |  | 292,000,000 |
Income Before Income Taxes | 734,000,000 |  | 688,000,000 |  | 456,000,000 |
Income Tax Expense | 267,000,000 |  | 254,000,000 |  | 163,000,000 |
Net Income | 467,000,000 |  | 434,000,000 |  | 293,000,000 |
Preferred Stock Dividends | 2,000,000 |  | 2,000,000 |  | 2,000,000 |
Net Income Available to Common Stockholders | 465,000,000 |  | 432,000,000 |  | 291,000,000 |
Net Income Attributable to Common Stockholders |  |  |  |  |  |
Net Income Available to Common Stockholders | $ 465,000,000 |  | $ 432,000,000 |  | $ 291,000,000 |
[1] | Consumers had no material equity method investments.
[2] | Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.
[3] | Includes an operating loss of $2 million ($1 million net of tax) at Exeter, whose assets and liabilities were reclassified as held for sale in 2009. Also includes disposal-related losses of $10 million in additional tax expense resulting from an IRS audit adjustment related to a 2003 asset sale, a $6 million ($4 million net of tax) loss for the write down of CMS Energy's investment in Exeter, a $5 million ($3 million net of tax) loss for the increase in a liability for a 2007 asset sale, and a $5 million ($3 million net of tax) loss on the settlement of a 2002 asset sale indemnity.
[4] | Includes an operating loss of $11 million ($7 million net of tax) at Exeter and a loss of $3 million ($2 million net of tax) related to a litigation settlement at CMS Viron. Also includes a gain for the expiration of an indemnity obligation related to a 2007 asset sale. CMS Energy provided an indemnity to TAQA in connection with the sale of its ownership interests in businesses in the Middle East, Africa, and India, and recorded a $50 million provision for the contingent liability. This indemnity expired in 2009 and CMS Energy eliminated the liability from its consolidated balance sheets, recognizing a $45 million benefit ($28 million net of tax) to income (loss) from discontinued operations and a $5 million benefit to gain on asset sales, net.

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- Definition The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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 SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8, 9, 10, 36, 37, 38 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 + Details
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