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Changes in Equity and Earnings Per Share - Summary of Changes in Other Comprehensive Income Reserves (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Other comprehensive income/(loss)    
Other comprehensive income/(loss) $ 2,859 $ 2,620
Translation reserves [member]    
Disclosure of information about changes in other comprehensive income reserves [line items]    
Beginning balance (32,076) (38,670)
Other comprehensive income/(loss)    
Exchange differences on translation of foreign operations (gains/(losses)) 2,857 2,694
Other comprehensive income/(loss) 2,857 2,694
Ending balance (29,219) (35,976)
Hedging reserves [member]    
Disclosure of information about changes in other comprehensive income reserves [line items]    
Beginning balance 390 490
Other comprehensive income/(loss)    
Cash flow hedges 61 (255)
Other comprehensive income/(loss) 61 (255)
Ending balance 451 235
Post- employment benefits [member]    
Disclosure of information about changes in other comprehensive income reserves [line items]    
Beginning balance (954) (1,020)
Other comprehensive income/(loss)    
Other comprehensive income/(loss) 0 0
Ending balance (954) (1,020)
OCI reserves [member]    
Disclosure of information about changes in other comprehensive income reserves [line items]    
Beginning balance (32,641) (39,201)
Other comprehensive income/(loss)    
Exchange differences on translation of foreign operations (gains/(losses)) 2,857 2,694
Cash flow hedges 61 (255)
Other comprehensive income/(loss) 2,918 2,439
Ending balance $ (29,722) $ (36,762)