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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value of plan assets [line items]      
Cash $ 701 $ 579  
Investments in corporate bonds 6,851 6,212  
Investments in government bonds 8,435 11,108  
Total fixed-income securities 15,987 17,899  
Investment in marketable securities 6,646 7,947  
Other investments and private funds 6,686 6,847  
Total variable-income securities 13,332 14,794  
Total plan assets 29,319 32,693 $ 28,854
Level 1 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 701 579  
Investments in corporate bonds 131 144  
Investments in government bonds 1,649 1,701  
Total fixed-income securities 2,481 2,424  
Investment in marketable securities 5,089 6,212  
Other investments and private funds 973 991  
Total variable-income securities 6,062 7,203  
Total plan assets 8,543 9,627  
Level 2 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 0 0  
Investments in corporate bonds 6,720 6,067  
Investments in government bonds 6,786 9,407  
Total fixed-income securities 13,506 15,474  
Investment in marketable securities 1,557 1,735  
Other investments and private funds 4,172 3,279  
Total variable-income securities 5,729 5,014  
Total plan assets 19,235 20,488  
Level 3 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 0 0  
Investments in corporate bonds 0 1  
Investments in government bonds 0 0  
Total fixed-income securities 0 1  
Investment in marketable securities 0 0  
Other investments and private funds 1,541 2,577  
Total variable-income securities 1,541 2,577  
Total plan assets $ 1,541 $ 2,578