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Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Operating Revenue | $ 1,445 | $ 1,507 | $ 4,830 | $ 4,583
Operating Expenses |  |  |  |
Fuel for electric generation | 165 | 190 | 466 | 446
Purchased and interchange power | 383 | 386 | 1,063 | 1,037
Purchased power - related parties | 21 | 23 | 67 | 65
Cost of gas sold | 76 | 80 | 849 | 763
Maintenance and other operating expenses | 285 | 295 | 871 | 872
Depreciation and amortization | 145 | 138 | 463 | 440
General taxes | 54 | 53 | 174 | 170
Gain on asset sales, net | (1) | (1) | (1) | (1)
Total operating expenses | 1,128 | 1,164 | 3,952 | 3,792
Operating Income | 317 | 343 | 878 | 791
Other Income (Expense) |  |  |  |
Interest income | 1 | 1 | 3 | 3
Allowance for equity funds used during construction | 1 | 2 | 5 | 6
Income from equity method investees | 3 | 5 | 11 | 13
Other income | 2 | 3 | 7 | 9
Other expense | (7) | (11) | (13) | (16)
Total other income (expense) |  |  | 13 | 15
Interest Charges |  |  |  |
Interest on long-term debt | 96 | 92 | 289 | 280
Other interest expense | 3 | 5 | 12 | 16
Allowance for borrowed funds used during construction |  | (1) | (2) | (3)
Total interest charges | 99 | 96 | 299 | 293
Income Before Income Taxes | 218 | 247 | 592 | 513
Income Tax Expense | 91 | 98 | 240 | 203
Income From Continuing Operations | 127 | 149 | 352 | 310
Income From Discontinued Operations, Net |  |  |  | 7
Net Income | 127 | 149 | 352 | 317
Income Attributable to Noncontrolling Interests | 1 | 1 | 2 | 2
Net Income Attributable to Common Stockholders |  |  |  |
Amounts attributable to continuing operations | 126 | 148 | 350 | 308
Amounts attributable to discontinued operations |  |  |  | 7
Net Income Available to Common Stockholders | 126 | 148 | 350 | 315
Income Attributable to Noncontrolling Interests |  |  |  |
Amounts attributable to continuing operations | 1 | 1 | 2 | 2
Amounts attributable to discontinued operations |  |  |  |
Income attributable to noncontrolling interests | 1 | 1 | 2 | 2
Basic Earnings Per Average Common Share |  |  |  |
Basic earnings from continuing operations | $ 0.48 | $ 0.56 | $ 1.32 | $ 1.18
Basic earnings from discontinued operations |  |  |  | $ 0.03
Basic earnings attributable to common stock | $ 0.48 | $ 0.56 | $ 1.32 | $ 1.21
Diluted Earnings Per Average Common Share |  |  |  |
Diluted earnings from continuing operations | $ 0.46 | $ 0.55 | $ 1.29 | $ 1.14
Diluted earnings from discontinued operations |  |  |  | $ 0.03
Diluted earnings attributable to common stock | $ 0.46 | $ 0.55 | $ 1.29 | $ 1.17
Dividends Declared Per Common Share | $ 0.255 | $ 0.24 | $ 0.765 | $ 0.72
Consumers Energy Company [Member] |  |  |  |
Operating Revenue | 1,386 | 1,448 | 4,647 | 4,405
Operating Expenses |  |  |  |
Fuel for electric generation | 148 | 166 | 406 | 382
Purchased and interchange power | 374 | 379 | 1,043 | 1,019
Purchased power - related parties | 21 | 23 | 67 | 65
Cost of gas sold | 64 | 74 | 818 | 734
Maintenance and other operating expenses | 270 | 284 | 825 | 827
Depreciation and amortization | 143 | 137 | 459 | 436
General taxes | 53 | 51 | 170 | 165
Gain on asset sales, net | (1) |  | (1) |
Total operating expenses | 1,072 | 1,114 | 3,787 | 3,628
Operating Income | 314 | 334 | 860 | 777
Other Income (Expense) |  |  |  |
Interest income |  |  | 2 | 2
Interest and dividend income - related parties | 1 | 1 | 1 | 1
Allowance for equity funds used during construction | 1 | 2 | 5 | 6
Other income | 2 | 3 | 11 | 14
Other expense | (3) | (11) | (9) | (16)
Total other income (expense) | 1 | (5) | 10 | 7
Interest Charges |  |  |  |
Interest on long-term debt | 58 | 56 | 177 | 175
Other interest expense | 2 | 4 | 8 | 12
Allowance for borrowed funds used during construction |  | (1) | (2) | (3)
Total interest charges | 60 | 59 | 183 | 184
Income Before Income Taxes | 255 | 270 | 687 | 600
Income Tax Expense | 102 | 107 | 272 | 239
Net Income | 153 | 163 | 415 | 361
Preferred Stock Dividends and Distribution | 1 | 1 | 2 | 2
Net Income Attributable to Common Stockholders |  |  |  |
Net Income Available to Common Stockholders | $ 152 | $ 162 | $ 413 | $ 359

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