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Finance Cost and Income - Summary of Finance Cost and Income Included in Income Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of finance income expense [line items]      
Interest expense $ (3,684) $ (4,016) $ (4,168)
Capitalization of borrowing costs 10 12 19
Net interest on net defined benefit liabilities (73) (82) (95)
Accretion expense (593) (564) (650)
Net losses on hedging instruments that are not part of a hedge accounting relationship (562) (502) (393)
Net foreign exchange results (net of the effect of foreign exchange derivative instruments) (101)   (180)
Tax on financial transactions (73) (103) (79)
Net mark-to-market results on derivatives related to the hedging of share-based payment (23) (1,211)  
Other financial costs, including bank fees (135) (135) (225)
Finance cost excluding exceptional items (5,234) (6,601) (5,771)
Exceptional finance cost (806) (1,818) (222)
Finance costs (6,040) (8,419) (5,993)
Interest income 113 150 292
Interest income on Brazilian tax credits 118 315 118
Hyperinflation monetary adjustments 152 76 86
Market-to-market gains on derivatives related to the hedging of share-based payment programs     898
Net foreign exchange results (net of the effect of foreign exchange derivative instruments)   43  
Other financial income 48 58 21
Finance income excluding exceptional items 431 642 1,415
Exceptional finance income   80 1,104
Finance income 431 722 2,519
Net finance income/(cost) excluding exceptional items (4,803) (5,959) (4,355)
Net finance income/(cost) $ (5,609) $ (7,697) $ (3,473)