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Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Net Income | $ 127 | $ 149 | $ 352 | $ 317
Net gain arising during the period, net of tax | 10 |  | 10 |
Prior service credit adjustment, net of tax | 5 |  | 5 |
Amortization of net actuarial loss, net of tax | 1 | 1 | 3 | 3
Unrealized gain (loss) on investments, net of tax | 1 | 1 | (2) | 3
Other Comprehensive Income (Loss) | 17 | 2 | 16 | 6
Comprehensive Income | 144 | 151 | 368 | 323
Comprehensive Income Attributable to Noncontrolling Interest | 1 | 1 | 2 | 2
Comprehensive Income Attributable to CMS Energy | 143 | 150 | 366 | 321
Consumers Energy Company [Member] |  |  |  |
Net Income | 153 | 163 | 415 | 361
Amortization of net actuarial loss, net of tax |  | 1 | 2 | 2
Reclassification adjustments included in net income, net of tax |  |  | (3) |
Other Comprehensive Income (Loss) |  | 1 | (1) | 2
Comprehensive Income | $ 153 | $ 164 | $ 414 | $ 363

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