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Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net Income | $ 454 | $ 384 | $ 417
Retirement Benefits Liability |  |  |
Net gain (loss) arising during the period, net of tax | 26 | (10) | (11)
Prior service credit adjustment, net of tax | 5 |  |
Amortization of net actuarial loss, net of tax | 4 | 2 | 2
Investments |  |  |
Unrealized gain (loss) on investments, net of tax | (2) | 2 |
Other Comprehensive Income (Loss) | 33 | (6) | (9)
Comprehensive Income | 487 | 378 | 408
Comprehensive Income Attributable to Noncontrolling Interest | 2 | 2 | 2
Comprehensive Income Attributable to CMS Energy | 485 | 376 | 406
Consumers Energy Company [Member] |  |  |
Net Income | 534 | 439 | 467
Retirement Benefits Liability |  |  |
Net gain (loss) arising during the period, net of tax | 5 | (8) | (4)
Amortization of net actuarial loss, net of tax | 3 | 2 | 1
Investments |  |  |
Unrealized gain (loss) on investments, net of tax | 1 | 3 | 1
Reclassification adjustments included in net income, net of tax | (3) | (3) |
Other Comprehensive Income (Loss) | 6 | (6) | (2)
Comprehensive Income | $ 540 | $ 433 | $ 465

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