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Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net Income | $ 81 | $ 101 | $ 225 | $ 168
Retirement benefits liability adjustments, net of tax | 1 | 1 | 2 | 2
Unrealized gain (loss) on investments, net of tax | (3) | 1 | (3) | 2
Other Comprehensive Income (Loss) | (2) | 2 | (1) | 4
Comprehensive Income | 79 | 103 | 224 | 172
Comprehensive Income Attributable to Noncontrolling Interest | 1 | 1 | 1 | 1
Comprehensive Income Attributable to CMS Energy | 78 | 102 | 223 | 171
Consumers Energy Company [Member] |  |  |  |
Net Income | 100 | 122 | 262 | 198
Retirement benefits liability adjustments, net of tax | 1 |  | 2 | 1
Unrealized gain (loss) on investments, net of tax | (4) | 3 |  |
Reclassification adjustments included in net income, net of tax |  |  | (3) |
Other Comprehensive Income (Loss) | (3) | 3 | (1) | 1
Comprehensive Income | $ 97 | $ 125 | $ 261 | $ 199

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