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Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Net Income | $ 84 | $ 81 | $ 288 | $ 225
Retirement Benefits Liability |  |  |  |
Amortization of net actuarial loss, net of tax | 1 | 1 | 1 | 2
Investments |  |  |  |
Unrealized gain (loss) on investments, net of tax |  | (3) |  | (3)
Derivative Instruments |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  | 1 |
Other Comprehensive Income (Loss) | 1 | (2) | 2 | (1)
Comprehensive Income | 85 | 79 | 290 | 224
Comprehensive Income Attributable to Noncontrolling Interest | 1 | 1 | 1 | 1
Comprehensive Income Attributable to CMS Energy | 84 | 78 | 289 | 223
Consumers Energy Company [Member] |  |  |  |
Net Income | 109 | 100 | 330 | 262
Retirement Benefits Liability |  |  |  |
Amortization of net actuarial loss, net of tax | 1 | 1 | 1 | 2
Investments |  |  |  |
Unrealized gain (loss) on investments, net of tax | 1 | (4) | 3 |
Reclassification adjustments included in net income, net of tax |  |  |  | (3)
Derivative Instruments |  |  |  |
Other Comprehensive Income (Loss) | 2 | (3) | 4 | (1)
Comprehensive Income | $ 111 | $ 97 | $ 334 | $ 261

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