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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current |  |  |
State | $ 2 | $ 6 | $ 19
Foreign | 4 | 0 | 0
Total — current | 6 | 6 | 19
Deferred |  |  |
U.S. Federal | (3,000) | (16) | (60)
State | (340) | 16 | (5)
Foreign | 0 | 1 | 2
Total — deferred | (3,340) | 1 | (63)
Income tax expense/(benefit) | (3,334) | 7 | (44)
Domestic and foreign components of income from continuing operations before income tax expense |  |  |
U.S. | 771 | 468 | (1,406)
Foreign | 15 | (1) | 17
Income/(Loss) from Continuing Operations Before Income Taxes | 786 | 467 | (1,389)
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations |  |  |
Income/(loss) from continuing operations before income taxes | 786 | 467 | (1,389)
Tax at federal statutory tax rate | 165 | 98 | (486)
State taxes | 13 | 18 | 19
Foreign operations | 0 | 0 | 2
Permanent differences | (9) | 7 | 0
Valuation allowance - current period activities | (3,492) | (106) | 455
Book goodwill impairment | 0 | 0 | 30
Deferred impact of state tax rate changes | 12 | 0 | 0
Production tax credits ("PTC") | 0 | (7) | (8)
Recognition of uncertain tax benefits | (10) | 1 | (5)
Alternative minimum tax ("AMT") refundable credit | 0 | (4) | (64)
Tax Act - corporate income tax rate change | 0 | 0 | 665
Valuation allowance due to corporate income tax rate change | 0 | 0 | (660)
Other | (13) | 0 | 8
Income tax expense/(benefit) | $ (3,334) | $ 7 | $ (44)
Effective income tax rate (as a percent) | (424.20%) | 1.50% | 3.20%

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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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