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Financial Instruments - Summary of Consolidated Net Monetary Assets (Liabilities) by Currency (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Monetary assets $ 50,783 $ 57,723
Monetary liabilities 317,210 340,455
Net monetary assets (liabilities) (266,427) (282,732)
US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (142,516) (157,203)
Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (16,309) (12,327)
Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (63,460) (68,605)
Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (26,850) (28,477)
Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (17,292) (16,120)
Mexico [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 8,400 11,798
Monetary liabilities 19,798 17,505
Net monetary assets (liabilities) (11,398) (5,707)
Mexico [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (560) (1,097)
Mexico [member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (10,838) (4,610)
Mexico [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
Mexico [member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
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 9,961 9,453
Monetary liabilities 33,464 32,158
Net monetary assets (liabilities) (23,503) (22,705)
United States [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (23,507) (22,710)
United States [member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 4 4
United States [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
United States [member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
United States [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 1
Europe [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 13,163 14,182
Monetary liabilities 40,153 45,675
Net monetary assets (liabilities) (26,990) (31,493)
Europe [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 153 39
Europe [member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 24
Europe [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (10,571) (10,155)
Europe [member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (18,241) (19,358)
Europe [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 1,669 (2,043)
South, Central America And Caribbean [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 6,046 7,347
Monetary liabilities 10,841 12,016
Net monetary assets (liabilities) (4,795) (4,669)
South, Central America And Caribbean [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (947) (126)
South, Central America And Caribbean [member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (6) 0
South, Central America And Caribbean [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 13 2
South, Central America And Caribbean [member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
South, Central America And Caribbean [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (3,855) (4,545)
Asia, Middle East and Africa [member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 10,216 9,780
Monetary liabilities 12,223 11,522
Net monetary assets (liabilities) (2,007) (1,742)
Asia, Middle East and Africa [member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 22 221
Asia, Middle East and Africa [member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
Asia, Middle East and Africa [member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 40 0
Asia, Middle East and Africa [member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) 0 0
Asia, Middle East and Africa [member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (2,069) (1,963)
Other Operations [Member]    
Disclosure of detailed information about financial instruments [line items]    
Monetary assets 2,997 5,163
Monetary liabilities 200,731 221,579
Net monetary assets (liabilities) (197,734) (216,416)
Other Operations [Member] | US Dollar [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (117,677) (133,530)
Other Operations [Member] | Pesos [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (5,469) (7,745)
Other Operations [Member] | Euro [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (52,942) (58,452)
Other Operations [Member] | Pounds [member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) (8,609) (9,119)
Other Operations [Member] | Other Currencies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net monetary assets (liabilities) $ (13,037) $ (7,570)