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Finance Cost and Income - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of finance income expense [line items]        
Share based payment of net (loss) gain   $ 23 $ 1,211 $ 898
Difference on share based payment gain loss   1,188    
Interest expense on lease liabilities   123 116 124
Interest expenses   3,684 4,016 4,168
Net finance income/(cost) excluding exceptional items   4,803 5,959 4,355
Mark to market gain (loss)   25 1,008 878
Unwinding of discount   349 306 374
Interest expense on bonds   67 102 110
Interest on provisions   54 41 42
Brazilian tax credits $ 226 226 481  
Income from interest on brazilian tax credits   118 315 118
Gain (loss) on early termination   741 795 84
Gain (loss) on remeasurement of deferred considerations   19 80 90
Foreign exchange translation losses on intragroup loans       52
Delta Corporation Ltd [member]        
Disclosure of finance income expense [line items]        
Write off company investment   22 $ 15 188
Brazilian federal tax regularization program [member]        
Disclosure of finance income expense [line items]        
Interest expenses       $ 34
SAB [member]        
Disclosure of finance income expense [line items]        
Income from interest on brazilian tax credits   $ 226    
Top of range [member]        
Disclosure of finance income expense [line items]        
Borrowing costs capitalised   4.00%