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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income (loss) before income taxes |  |  |
United States | $ 9,472 | $ 16,739 | $ 8,024
Foreign | 6,816 | 11,489 | 4,688
Income (loss) before income taxes | 16,288 | 28,228 | 12,712
Federal statutory income tax | 3,421 | 5,928 | 2,670
Non-U.S. effective tax rates | 2,063 | 3,866 | 1,915
Recovery of outside basis | (4) | (30) | (55)
Adjustment to tax reserves | (317) | (551) | (11)
Adjustment to valuation allowance | (2) | 5 | (45)
State income tax | 214 | 405 | 194
Enhanced oil recovery credit | 0 | (37) | (99)
Other | (44) | (38) | 64
Total tax provision (benefit) | $ 5,331 | $ 9,548 | $ 4,633
Income (loss) before income taxes, United States, Percent of Pre-Tax Income (Loss) | 58.20% | 59.30% | 63.10%
Income (loss) before income taxes, Foreign, Percent of Pre-Tax Income (Loss) | 41.80% | 40.70% | 36.90%
Income (loss) before income taxes, Percent of Pre-Tax Income (Loss) | 100.00% | 100.00% | 100.00%
Federal statutory income tax, Percent of Pre-Tax Income (Loss) | 21.00% | 21.00% | 21.00%
Non-U.S. effective tax rates, Percent of Pre-Tax Income (Loss) | 12.70% | 13.70% | 15.10%
Recovery of outside basis, Percent of Pre-Tax Income (Loss) | 0.00% | (0.10%) | (0.40%)
Adjustment to tax reserves, Percent of Pre-Tax Income (Loss) | (1.90%) | (2.00%) | (0.10%)
Adjustment to valuation allowances, Percent of Pre-Tax Income (Loss) | 0.00% | 0.00% | (0.40%)
State income tax, Percent of Pre-Tax Income (Loss) | 1.30% | 1.40% | 1.50%
Enhanced oil recovery credit, Percent of Pre-Tax Income (Loss) | 0.00% | (0.10%) | (0.80%)
Other, Percent of Pre-Tax Income (Loss) | (0.30%) | (0.10%) | 0.50%
Total, Percent of Pre-Tax Income (Loss) | 32.70% | 33.80% | 36.40%

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