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Contingencies and commitments - Summary of aggregate amount of future payment commitments under purchase obligations outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of future payment commitments under purchase obligations [Line Items]    
Minimum lease payments payable under non-cancellable operating lease   $ 1,717
Aggregate amount of future payment commitments under purchase obligations outstanding $ 16,919 17,050
Within 1 year [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Minimum lease payments payable under non-cancellable operating lease   475
Aggregate amount of future payment commitments under purchase obligations outstanding 2,920 2,804
Between 1 and 3 years [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Minimum lease payments payable under non-cancellable operating lease   587
Between 3 and 5 years [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Minimum lease payments payable under non-cancellable operating lease   270
More than 5 years [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Minimum lease payments payable under non-cancellable operating lease   385
Aggregate amount of future payment commitments under purchase obligations outstanding 8,697 9,358
Between 1 and 2 years [Member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,705 1,565
Between 2 and 3 years [Member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,431 1,344
Between 3 and 4 years [Member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,084 1,097
Between 4 and 5 years [Member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding $ 1,082 $ 882