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Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Net Income | $ 94 | $ 127 | $ 382 | $ 352
Retirement Benefits Liability |  |  |  |
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 | 2 | 3
Amortization of prior service credit, net of tax | (1) |  | (1) |
Investments |  |  |  |
Unrealized gain (loss) on investments, net of tax |  | 1 |  | (2)
Derivative Instruments |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  | 1 |
Other Comprehensive Income (Loss) |  | 17 | 2 | 16
Comprehensive Income | 94 | 144 | 384 | 368
Comprehensive Income Attributable to Noncontrolling Interest |  | 1 | 1 | 2
Comprehensive Income Attributable to CMS Energy | 94 | 143 | 383 | 366
Consumers Energy Company [Member] |  |  |  |
Net Income | 119 | 153 | 449 | 415
Retirement Benefits Liability |  |  |  |
Amortization of net actuarial loss, net of tax | 1 |  | 2 | 2
Investments |  |  |  |
Unrealized gain (loss) on investments, net of tax | (1) |  | 2 |
Reclassification adjustments included in net income, net of tax |  |  |  | (3)
Derivative Instruments |  |  |  |
Other Comprehensive Income (Loss) |  |  | 4 | (1)
Comprehensive Income | $ 119 | $ 153 | $ 453 | $ 414

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