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Segmental information - additional information - Disclosure of sales revenue by destination (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 100.00% 100.00%
Consolidated sales revenue $ 29,775 $ 33,083
China    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 52.10% 59.90%
Consolidated sales revenue $ 15,521 $ 19,805
UNITED STATES    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 16.30% 11.50%
Consolidated sales revenue $ 4,848 $ 3,816
Asia (excluding China and Japan)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 9.10% 9.50%
Consolidated sales revenue $ 2,698 $ 3,157
Japan    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 6.80% 7.20%
Consolidated sales revenue $ 2,039 $ 2,373
Europe (excluding UK)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 6.70% 5.00%
Consolidated sales revenue $ 1,995 $ 1,667
Canada    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 3.10% 2.40%
Consolidated sales revenue $ 933 $ 793
Australia    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 2.00% 1.60%
Consolidated sales revenue $ 596 $ 519
UK    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 0.40% 0.50%
Consolidated sales revenue $ 133 $ 166
Other countries    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 3.50% 2.40%
Consolidated sales revenue $ 1,012 $ 787