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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, 2020
Dec. 31, 2019
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding $ 16,633 $ 16,919
Due within 1 year    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 3,100 2,920
Between 1 and 2 years    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,715 1,705
Between 2 and 3 years    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,291 1,431
Between 3 and 4 years    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 1,242 1,084
Between 4 and 5 years    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 848 1,082
More than 5 years    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding $ 8,437 $ 8,697