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Interest-Bearing Loans and Borrowings - Summary of Changes in the Company's Liabilities Arising from Financing Activities (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Proceeds from borrowings $ 555 $ 4,067  
Repayments of borrowings (309) (3,998)  
Amortized cost 92,058   $ 93,184
Long-term debt, net of current portion [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 72,128 70,720  
Proceeds from borrowings 80 3,502  
Repayments of borrowings (34) (3,424)  
Capitalization/(payment) of lease liabilities 136 182  
Amortized cost 29 34  
Unrealized foreign exchange effects (763) 3,269  
Current portion of long-term debt (2,671) (2,313)  
(Gain)/Loss on bond redemption and other movements 1 8  
Ending balance 68,908 71,979  
Short-term debt and current portion of long-term debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 885 1,449  
Proceeds from borrowings 475 565  
Repayments of borrowings (276) (574)  
Capitalization/(payment) of lease liabilities (312) (335)  
Amortized cost 1 1  
Unrealized foreign exchange effects (67) 156  
Current portion of long-term debt 2,671 2,313  
(Gain)/Loss on bond redemption and other movements 3 4  
Ending balance $ 3,381 $ 3,578