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Changes in Equity and Earnings Per Share - Summary of Changes in Other Comprehensive Income Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits $ (136) $ 519 $ 504
Other comprehensive income/(loss) 3,876 (1,315) (3,881)
Translation reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (34,677) (33,554) (29,234)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) 4,497 (1,123) (4,320)
Cash flow hedges     0
Other comprehensive income/(loss) 4,497 (1,123) (4,320)
Ending balance (30,180) (34,677) (33,554)
Hedging reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance 145 481 376
Other comprehensive income/(loss)      
Cash flow hedges 36 (336) 105
Other comprehensive income/(loss) 36 (336) 105
Ending balance 181 145 481
Post- employment benefits [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (1,021) (1,504) (1,983)
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits (134) 483 479
Other comprehensive income/(loss) (134) 483 479
Ending balance (1,155) (1,021) (1,504)
OCI reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (35,553) (34,577) (30,841)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) 4,497 (1,123) (4,320)
Cash flow hedges 36 (336) 105
Re-measurements of post-employment benefits (134) 483 479
Other comprehensive income/(loss) 4,398 (976) (3,736)
Ending balance $ (31,155) $ (35,553) $ (34,577)