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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, 2018
Jan. 01, 2018
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding $ 17,050 $ 19,480
Due within 1 year [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding 2,804 2,874
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 1,565 1,712
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 1,344 1,401
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 1,097 1,282
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 882 1,026
More than 5 years [member]    
Disclosure of future payment commitments under purchase obligations [Line Items]    
Aggregate amount of future payment commitments under purchase obligations outstanding $ 9,358 $ 11,185