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Income Taxes | 3 Months Ended
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Mar. 31, 2019
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes Effective Income Tax Rate The income tax provision consisted of the following:
| Three months ended March 31,
In millions, except rates | 2019 |  | 2018
Income before income taxes | $ | 98 |  |  | $ | 244 |
Income tax expense from continuing operations | 4 |  |  | 6 |
Effective income tax rate | 4.1 | % |  | 2.5 | %
For the three months ended March 31, 2019 and 2018, NRG's overall effective tax rate was lower than the statutory rate of 21%, primarily due to the tax benefit for the change in valuation allowance, partially offset by current state tax expense. Uncertain Tax Benefits As of March 31, 2019, NRG has recorded a non-current tax liability of $31 million for uncertain tax benefits from positions taken on various state income tax returns, including accrued interest. For the three months ended March 31, 2019, NRG accrued an immaterial amount of interest relating to the uncertain tax benefits. As of March 31, 2019, NRG had cumulative interest and penalties related to these uncertain tax benefits of $5 million. The Company recognizes interest and penalties related to uncertain tax benefits in income tax expense. NRG is subject to examination by taxing authorities for income tax returns filed in the U.S. federal jurisdiction and various state and foreign jurisdictions including operations located in Australia. The Company is no longer subject to U.S. federal income tax examinations for years prior to 2015. With few exceptions, state and local income tax examinations are no longer open for years before 2010.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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