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Financial Instruments - Summary of Consolidated Net Monetary Assets (Liabilities) by Currency (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Monetary assets $ 4,126 $ 3,802
Monetary liabilities 14,504 15,859
Net monetary assets (liabilities) (10,378) (12,057)
US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (6,524) (7,033)
Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (824) (924)
Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (1,884) (2,223)
British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (516) (613)
Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (630) (1,264)
Mexico [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 1,683 1,627
Monetary liabilities 1,859 2,184
Net monetary assets (liabilities) (176) (557)
Mexico [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (149) (157)
Mexico [member] | Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (27) (400)
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 648 651
Monetary liabilities 2,893 2,679
Net monetary assets (liabilities) (2,245) (2,028)
United States [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (2,248) (2,030)
United States [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 3 2
Europe, Middle East and Africa [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 1,216 1,491
Monetary liabilities 2,699 3,087
Net monetary assets (liabilities) (1,483) (1,596)
Europe, Middle East and Africa [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (16) (5)
Europe, Middle East and Africa [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (606) (660)
Europe, Middle East and Africa [member] | British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (601) (710)
Europe, Middle East and Africa [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (260) (221)
SCA&C [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 241 274
Monetary liabilities 701 730
Net monetary assets (liabilities) (460) (456)
SCA&C [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (24) (61)
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) (436) (395)
Other Operations [Member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 338 (241)
Monetary liabilities 6,352 7,179
Net monetary assets (liabilities) (6,014) (7,420)
Other Operations [Member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (4,087) (4,780)
Other Operations [Member] | Mexican peso [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (797) (524)
Other Operations [Member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (1,278) (1,563)
Other Operations [Member] | British Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 85 97
Other Operations [Member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) $ 63 $ (650)