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Finance Cost and Income - Summary of Finance Income Included in Income Statement (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of Finance Income [abstract]    
Interest income $ 98 $ 152
Hyperinflation monetary adjustments 30 48
Market-to-market gains on derivatives related to the hedging of share-based payment programs   1,124
Net foreign exchange results (net of the effect of foreign exchange derivative instruments) 61  
Other financial income 4 15
Finance income, excluding exceptional items 193 1,339
Exceptional finance income 50 1,247
Finance income $ 243 $ 2,586 [1]
[1] The unaudited condensed consolidated interim income statement for the six-month period ended 30 June 2019 has been restated to reflect the classification of the Australian operations as discontinued operations.