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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits $ 141 $ (136) $ 519
Other comprehensive income/(loss) (8,812) 3,876 (1,315)
Translation reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (30,180) (34,677) (33,554)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) (8,490) 4,497 (1,123)
Other comprehensive income/(loss) (8,490) 4,497 (1,123)
Ending balance (38,670) (30,180) (34,677)
Hedging reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance 181 145 481
Other comprehensive income/(loss)      
Cash flow hedges 309 36 (336)
Other comprehensive income/(loss) 309 36 (336)
Ending balance 490 181 145
Post- employment benefits [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (1,155) (1,021) (1,504)
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits 135 (134) 483
Other comprehensive income/(loss) 135 (134) 483
Ending balance (1,020) (1,155) (1,021)
OCI reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (31,155) (35,553) (34,577)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) (8,490) 4,497 (1,123)
Cash flow hedges 309 36 (336)
Re-measurements of post-employment benefits 135 (134) 483
Other comprehensive income/(loss) (8,046) 4,398 (976)
Ending balance $ (39,201) $ (31,155) $ (35,553)