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Income Taxes - Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current |  |  |
State | $ 19 | $ 6 | $ 9
Total — current | 19 | 6 | 9
Deferred |  |  |
U.S. Federal | (6) | 3 | 1,020
State | (7) | (6) | 315
Foreign | 2 | 2 | 1
Total — deferred | $ (11) | $ (1) | $ 1,336
Effective income tax rate (as a percent) | (0.50%) | (0.50%) | (27.00%)
Domestic and foreign components of income from continuing operations before income tax expense |  |  |
U.S. | $ (1,557) | $ (989) | $ (4,997)
Foreign | 17 | 11 | 11
Income tax expense | $ 8 | $ 5 | 1,345
U.S. federal statutory rate (as a percent) | 35.00% | 35.00% |
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations |  |  |
Loss before income taxes | $ (1,540) | $ (978) | (4,986)
Tax at 35% | (539) | (342) | (1,745)
State taxes | 19 | 0 | (215)
Foreign operations | 2 | 10 | 1
Federal and state tax credits, excluding PTCs | 0 | 0 | (5)
Tax Act - corporate income tax rate change | 733 | 0 | 0
Valuation allowance due to corporate income tax rate change | (660) | 0 | 0
Valuation allowance due to corporate income tax rate change | 482 | 398 | 3,023
Impact of non-taxable equity earnings | (5) | 22 | (10)
Book goodwill impairment | 30 | 0 | 340
Net interest accrued on uncertain tax positions | 0 | 1 | (3)
Production tax credits | (20) | (26) | (33)
Recognition of uncertain tax benefits | (5) | 2 | (15)
Tax expense attributable to consolidated partnerships | 4 | (1) | 12
State rate change including true-up to current period activity | 18 | (59) | (7)
AMT refundable credit | (64) | 0 | 0
Other | 13 | 0 | 2
Income tax expense | $ 8 | $ 5 | $ 1,345
Effective income tax rate (as a percent) | (0.50%) | (0.50%) | (27.00%)

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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 investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -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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