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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current |  |  |
State | $ 6 | $ 19 | $ 6
Total — current | 6 | 19 | 6
Deferred |  |  |
U.S. Federal | (16) | (60) | 23
State | 16 | (5) | (6)
Foreign | 1 | 2 | 2
Total — deferred | 1 | (63) | 19
Income tax expense/(benefit) | 7 | (44) | 25
Domestic and foreign components of income from continuing operations before income tax expense |  |  |
U.S. | 468 | (1,406) | (942)
Foreign | (1) | 17 | 11
Income/(Loss) from Continuing Operations Before Income Taxes | 467 | (1,389) | (931)
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations |  |  |
Income/(loss) from continuing operations before income taxes | 467 | (1,389) | (931)
Tax at federal statutory tax rate | 98 | (486) | (326)
State taxes | 18 | 19 | 0
Foreign operations | 0 | 2 | 10
Permanent differences | 7 | 0 | 0
Tax Act - corporate income tax rate change | 0 | 665 | 0
Valuation allowance due to corporate income tax rate change | 0 | (660) | 0
Valuation allowance due to corporate income tax rate change | (106) | 455 | 382
Impact of non-taxable equity earnings | 0 | (5) | 22
Book goodwill impairment | 0 | 30 | 0
Net interest accrued on uncertain tax positions | 0 | 0 | 1
Production tax credits (PTC) | (7) | (8) | (7)
Recognition of uncertain tax benefits | 1 | (5) | 2
State rate change including true-up to current period activity | 0 | 0 | (59)
Alternative minimum tax (AMT) refundable credit | (4) | (64) | 0
Other | 0 | 13 | 0
Income tax expense/(benefit) | $ 7 | $ (44) | $ 25
Effective income tax rate (as a percent) | 1.50% | 3.20% | (2.70%)

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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