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v3.4.0.3

New Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Unamortized debt issuance costs | $ 40 |  | $ 41
Income Tax Benefit | 74 | $ 100 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
Income Tax Benefit | 6 |  |
Retained Earnings (Accumulated Deficit) [Member] |  |  |
Cumulative effect of change in accounting principle | 33 |  |
Consumers Energy Company [Member] |  |  |
Unamortized debt issuance costs | 22 |  | $ 23
Income Tax Benefit | 82 | $ 110 |
Consumers Energy Company [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
Income Tax Benefit | $ 6 |  |

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