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Segmental informtion - Disclosure Of Sales Revenue By Destination (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 100.00% 100.00%
Consolidated sales revenue $ 19,362 $ 20,722
China    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 54.90% 49.80%
Consolidated sales revenue $ 10,633 $ 10,321
Asia (excluding China and Japan)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 11.10% 11.20%
Consolidated sales revenue $ 2,155 $ 2,331
United States of America    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 12.40% 13.70%
Consolidated sales revenue $ 2,392 $ 2,834
Japan    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 8.30% 8.70%
Consolidated sales revenue $ 1,598 $ 1,793
Europe (excluding UK)    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 5.90% 7.10%
Consolidated sales revenue $ 1,143 $ 1,466
Canada    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 2.90% 4.00%
Consolidated sales revenue $ 585 $ 821
Australia    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 1.80% 1.60%
Consolidated sales revenue $ 351 $ 325
UK    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 0.60% 0.50%
Consolidated sales revenue $ 112 $ 115
Other countries    
Disclosure of geographical areas [line items]    
Sales revenue by destination (as a percent) 2.10% 3.40%
Consolidated sales revenue $ 393 $ 716