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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits $ 65 $ 141 $ (136)
Other comprehensive income/(loss) 6,726 (8,812) 3,876
Translation reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (38,670) (30,180) (34,677)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) 6,594 (8,490) 4,497
Other comprehensive income/(loss) 6,594 (8,490) 4,497
Ending balance (32,076) (38,670) (30,180)
Hedging reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance 490 181 145
Other comprehensive income/(loss)      
Cash flow hedges (100) 309 36
Other comprehensive income/(loss) (100) 309 36
Ending balance 390 490 181
Post- employment benefits [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (1,020) (1,155) (1,021)
Other comprehensive income/(loss)      
Re-measurements of post-employment benefits 66 135 (134)
Other comprehensive income/(loss) 66 135 (134)
Ending balance (954) (1,020) (1,155)
OCI reserves [member]      
Disclosure of information about changes in other comprehensive income reserves [line items]      
Beginning balance (39,201) (31,155) (35,553)
Other comprehensive income/(loss)      
Exchange differences on translation of foreign operations (gains/(losses)) 6,594 (8,490) 4,497
Cash flow hedges (100) 309 36
Re-measurements of post-employment benefits 66 135 (134)
Other comprehensive income/(loss) 6,560 (8,046) 4,398
Ending balance $ (32,641) $ (39,201) $ (31,155)