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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Current |  |  |
U.S. Federal | $ 3 | $ 0 | $ 0
State | 65 | 48 | 22
Foreign | 3 | 3 | 4
Total — current | 71 | 51 | 26
Deferred |  |  |
U.S. Federal | 258 | 569 | 168
State | 59 | 36 | 60
Foreign | 54 | 16 | (3)
Total — deferred | 371 | 621 | 225
Total income tax expense | 442 | 672 | 251
Domestic and foreign components of income from continuing operations before income tax expense |  |  |
U.S. | 1,436 | 2,759 | 749
Foreign | 227 | 100 | 12
Income Before Income Taxes | 1,663 | 2,859 | 761
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations |  |  |
Income before income taxes | 1,663 | 2,859 | 761
Tax at federal statutory tax rate | 349 | 600 | 160
Foreign operations | 7 | (3) | 0
State taxes | 69 | 111 | 18
Permanent differences | 17 | 8 | 8
Changes in valuation allowance | (3) | (29) | 24
Deferred impact of state tax rate changes | 14 | (10) | 2
Recognition of uncertain tax benefits | 8 | (10) | 3
Carbon capture tax credits | (19) | 0 | 0
Return to provision adjustments | 0 | 5 | 36
Total income tax expense | $ 442 | $ 672 | $ 251
Effective income tax rate (as a percent) | 26.60% | 23.50% | 33.00%

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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 state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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