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Taxes - Schedule for Principal Reasons for Difference in Effective and Statutory Tax Rates (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amount |  |  |
U.S. federal statutory tax rate | $ 4,825 | $ 3,567 | $ 5,937
State and local income taxes, net of federal income tax effect | 566 | 664 | 1,104
Foreign tax effects | (68) | (16) | (120)
Effect of cross-border tax laws | 0 | 18 | 15
Tax credits | (27) | (27) | (30)
Changes in valuation allowances | 15 | 0 | 11
Nontaxable or nondeductible items |  |  |
Goodwill impairment | 0 | 1,149 | 0
Other | (116) | (133) | (145)
Changes in unrecognized tax benefits | 40 | (27) | (118)
Other adjustments |  |  |
Federal refund claims | (17) | (245) | 0
Other | (188) | (58) | (131)
Total income tax provision | $ 5,030 | $ 4,892 | $ 6,523
Percent |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% | 21.00%
State and local income taxes, net of federal income tax effect | 2.50% | 3.90% | 3.90%
Foreign tax effects | (0.30%) | (0.10%) | (0.40%)
Effect of cross-border tax laws | 0.00% | 0.10% | 0.10%
Tax credits | (0.10%) | (0.20%) | (0.10%)
Changes in valuation allowances | 0.10% | 0.00% | 0.00%
Nontaxable or nondeductible items |  |  |
Goodwill impairment | 0.00% | 6.80% | 0.00%
Other | (0.50%) | (0.80%) | (0.50%)
Changes in unrecognized tax benefits | 0.20% | (0.20%) | (0.40%)
Other adjustments |  |  |
Federal refund claims | (0.10%) | (1.40%) | 0.00%
Other | (0.90%) | (0.30%) | (0.50%)
Effective income tax rate | 21.90% | 28.80% | 23.10%

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