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Income Taxes - Summary of Reconciliation of Effective Tax Rate with Aggregated Weighted Nominal Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Income Taxes [line items]      
Profit/(loss) before tax $ 11,328 $ 10,568 $ 9,124
Deduct share of results of associates 378 329 295
Deduct exceptional share of results of associates 9 104 (35)
Profit before tax and before share of results of associates 10,941 10,134 8,864
Adjustments to the tax basis      
Government incentives (149) (376) (756)
Non-deductible/(non-taxable) mark-to-market on derivatives 213 1,211 325
Other expenses not deductible for tax purposes 1,263 1,666 1,521
Other non-taxable income (733) (560) (647)
Adjusted tax basis $ 11,534 $ 12,074 $ 9,306
Aggregate weighted nominal tax rate 26.90% 26.40% 27.50%
Tax at aggregated nominal tax rate $ (3,098) $ (3,183) $ (2,558)
Adjustments on tax expense      
Recognition/(de-recognition) of deferred tax assets on tax losses (carried forward) (193) (171) (166)
(Underprovided)/overprovided in prior years 78 (211) (95)
Deductions from interest on equity 252 240 781
Deductions from goodwill and other tax deductions 642 723 466
Change in tax rate 28 10 2
Withholding taxes (509) (497) (559)
Other tax adjustments (49) (62) (105)
Total tax expense $ (2,850) $ (3,152) $ (2,234)
Effective tax rate 26.10% 31.10% 25.20%