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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current |  |  |
State | $ 48 | $ 22 | $ 2
Foreign | 3 | 4 | 4
Total — current | 51 | 26 | 6
Deferred |  |  |
U.S. Federal | 569 | 168 | (3,000)
State | 36 | 60 | (340)
Foreign | 16 | (3) | 0
Total — deferred | 621 | 225 | (3,340)
Total income tax expense/(benefit) | 672 | 251 | (3,334)
Domestic and foreign components of income from continuing operations before income tax expense |  |  |
U.S. | 2,759 | 749 | 771
Foreign | 100 | 12 | 15
Income from Continuing Operations Before Income Taxes | 2,859 | 761 | 786
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations |  |  |
Income from continuing operations before income taxes | 2,859 | 761 | 786
Tax at federal statutory tax rate | 600 | 160 | 165
Foreign operations | (3) | 0 | 0
State taxes | 111 | 18 | 13
Permanent differences | 8 | 8 | (9)
Changes in valuation allowance | (29) | 24 | (3,492)
Deferred impact of state tax rate changes | (10) | 2 | 12
Recognition of uncertain tax benefits | (10) | 3 | (10)
Return to provision adjustments | 5 | 36 | 0
Other | 0 | 0 | (13)
Total income tax expense/(benefit) | $ 672 | $ 251 | $ (3,334)
Effective income tax rate (as a percent) | 23.50% | 33.00% | (424.20%)

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