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Capital and Financial Risk Management - Summary of Foreign Currency Risk (Detail) - Foreign currency risk [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of foreign currency risk [Line Items]      
Impact on profit before tax (+5 %) [1] $ 22 $ 19 $ (4)
Impact on profit before tax (-5 %) [1] 22 19 (4)
Impact on total equity (+5 %) [1] 123 157 177
Impact on total equity (-5 %) [1] 123 157 177
Impact on financial instruments (+5%) [1] 44 27 11
Impact on financial instruments (-5%) [1] $ 44 $ 27 $ 11
[1] Sensitivity analysis for exchange rates has been presented for continuing operations only.