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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Taxes [line items]      
Profit/(loss) before tax $ 8,463 $ 2,079 $ 12,776
Deduct share of results of associates and joint ventures 248 156 152
Profit/(loss) before tax and before share of results of associates and joint ventures 8,215 1,924 12,624
Adjustments to the tax basis      
Government incentives (543) (428) (709)
Non-deductible/(non-taxable) mark-to-market on derivatives 48 2,219 (1,776)
Non-deductible impairment of goodwill   2,500  
Other expenses not deductible for tax purposes 1,979 1,512 1,223
Other non-taxable income (476) (250) (282)
Gross adjustments on taxable basis $ 9,223 $ 7,477 $ 11,080
Aggregate weighted nominal tax rate 26.70% 27.70% 26.20%
Tax at aggregated nominal tax rate $ (2,463) $ (2,069) $ (2,901)
Adjustments on tax expense      
Utilization of tax losses not previously recognized 24 13 13
Recognition of deferred taxes on previous years' tax losses 5 48 27
Write-down of deferred tax assets on losses and current year losses for which no deferred tax asset is recognized (314) (386) (137)
(Underprovided)/overprovided in prior years 159 119 58
Deductions from interest on equity 469 431 666
Deductions from goodwill 14 16 20
Other tax deductions 212 218 259
Change in tax rate (147) 61 (95)
Withholding taxes (485) (423) (505)
Other tax adjustments 175 39 (191)
Total income tax expense $ (2,350) $ (1,932) $ (2,786)
Effective tax rate 28.60% 100.40% 22.10%