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Segmental information - additional information - Disclosure of sales revenue by destination (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 100.00% 100.00%
Consolidated sales revenue $ 33,083 $ 19,362
China    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 59.90% 54.90%
Consolidated sales revenue $ 19,805 $ 10,633
Asia (excluding China and Japan)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 9.50% 11.10%
Consolidated sales revenue $ 3,157 $ 2,155
United States of America    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 11.50% 12.40%
Consolidated sales revenue $ 3,816 $ 2,392
Japan    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 7.20% 8.30%
Consolidated sales revenue $ 2,373 $ 1,598
Europe (excluding UK)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 5.00% 5.90%
Consolidated sales revenue $ 1,667 $ 1,143
Canada    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 2.40% 2.90%
Consolidated sales revenue $ 793 $ 585
Australia    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 1.60% 1.80%
Consolidated sales revenue $ 519 $ 351
UK    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 0.50% 0.60%
Consolidated sales revenue $ 166 $ 112
Other countries    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 2.40% 2.10%
Consolidated sales revenue $ 787 $ 393