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Risks Arising from Financial Instruments - Summary of Effective Interest Rates at Balance Sheet (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Before hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 334 $ 184
Before hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 72,693 $ 71,986
Before hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 0.00% 0.00%
Hedging $ 0 $ 0
Before hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 5.30% 5.10%
Hedging $ 41,499 $ 46,192
Before hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.70% 2.50%
Hedging $ 28,593 $ 22,653
Before hedging [Member] | Chinese Yuan [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.80% 3.20%
Hedging $ 38 $ 41
Before hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.50% 4.50%
Hedging $ 566 $ 555
Before hedging [Member] | South Korean Won [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 5.30% 4.90%
Hedging $ 39 $ 40
Before hedging [Member] | Mexican Peso [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 13.20% 15.70%
Hedging $ 225 $ 239
Before hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.50% 3.30%
Hedging $ 567 $ 1,154
Before hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 11.00% 11.20%
Hedging $ 334 $ 184
Before hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 9.60% 8.60%
Hedging $ 1,165 $ 1,111
After hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1,527 1,975
After hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 71,500 $ 70,195
After hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.90% 5.30%
Hedging $ 1,193 $ 1,792
After hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 5.60% 5.40%
Hedging $ 32,965 $ 36,780
After hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.60% 2.50%
Hedging $ 29,274 $ 23,530
After hedging [Member] | Chinese Yuan [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.70% 2.60%
Hedging $ 2,768 $ 2,921
After hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.30% 4.40%
Hedging $ 2,668 $ 2,657
After hedging [Member] | South Korean Won [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.70% 2.30%
Hedging $ 2,049 $ 2,200
After hedging [Member] | Mexican Peso [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 13.20% 10.80%
Hedging $ 225 $ 1,239
After hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.70% 2.60%
Hedging $ 37 $ 34
After hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 10.90% 11.20%
Hedging $ 333 $ 184
After hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 9.50% 10.10%
Hedging $ 1,515 $ 833