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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value of plan assets [line items]      
Cash $ 690 $ 2,099  
Investments in corporate bonds 6,212 3,667  
Investments in government bonds 11,108 10,290  
Total fixed-income securities 18,010 16,056  
Investment in marketable securities 7,947 7,957  
Other investments and private funds 6,736 4,841  
Total variable-income securities 14,683 12,798  
Total plan assets 32,693 28,854 $ 25,571
Level 1 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 579 1,075  
Investments in corporate bonds 144 1,050  
Investments in government bonds 1,701 209  
Total fixed-income securities 2,424 2,334  
Investment in marketable securities 6,212 2,001  
Other investments and private funds 991 770  
Total variable-income securities 7,203 2,771  
Total plan assets 9,627 5,105  
Level 2 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 0 1,024  
Investments in corporate bonds 6,067 2,617  
Investments in government bonds 9,407 10,081  
Total fixed-income securities 15,474 13,722  
Investment in marketable securities 1,735 5,956  
Other investments and private funds 3,279 3,478  
Total variable-income securities 5,014 9,434  
Total plan assets 20,488 23,156  
Level 3 [Member]      
Disclosure of fair value of plan assets [line items]      
Cash 111 0  
Investments in corporate bonds 1 0  
Investments in government bonds 0 0  
Total fixed-income securities 112 0  
Investment in marketable securities 0 0  
Other investments and private funds 2,466 593  
Total variable-income securities 2,466 593  
Total plan assets $ 2,578 $ 593