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Financial Instruments - Summary of Consolidated Net Monetary Assets (Liabilities) by Currency (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Monetary assets $ 3,802 $ 3,129
Monetary liabilities 15,859 15,090
Net monetary assets (liabilities) (12,057) (11,961)
US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (7,033) (7,564)
Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (924) (1,071)
Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (2,223) (1,815)
British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (613) (760)
Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (1,264) (751)
Mexico [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 1,627 960
Monetary liabilities 2,184 1,951
Net monetary assets (liabilities) (557) (991)
Mexico [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (157) 8
Mexico [member] | Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (400) (999)
Mexico [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
United States [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 651 650
Monetary liabilities 2,679 2,559
Net monetary assets (liabilities) (2,028) (1,909)
United States [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (2,030) (1,909)
United States [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 2  
SCA&C [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 274 204
Monetary liabilities 730 519
Net monetary assets (liabilities) (456) (315)
SCA&C [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (61) (42)
SCA&C [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
SCA&C [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (395) (273)
Asia, Middle East and Africa [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 1,491 1,315
Monetary liabilities 3,087 2,887
Net monetary assets (liabilities) (1,596) (1,572)
Asia, Middle East and Africa [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (5) 12
Asia, Middle East and Africa [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (660) (632)
Asia, Middle East and Africa [member] | British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (710) (931)
Asia, Middle East and Africa [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (221) (21)
Other Operations [Member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets (241) 0
Monetary liabilities 7,179 7,174
Net monetary assets (liabilities) (7,420) (7,174)
Other Operations [Member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (4,780) (5,633)
Other Operations [Member] | Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (524) (72)
Other Operations [Member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (1,563) (1,183)
Other Operations [Member] | British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 97 171
Other Operations [Member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) $ (650) $ (457)