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Valuation of derivatives interest cost from labor obligations and other financial items net - Schedule of Valuation of Derivatives and Other Financial Items (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of detailed information about financial instruments [abstract]        
Gain (loss) in valuation of derivatives, net $ 4,432,023   $ (4,686,407) $ 8,192,567
Capitalized interest expense (Note 10 c) 2,233,358   2,020,288 2,875,034
Commissions (2,820,477)   (1,901,473) (1,263,701)
Interest cost of labor obligations (Note 18) (11,377,054)   (9,968,526) (8,722,611)
Interest expense on taxes (516,522)   (555,921) (1,503,981)
Dividend received (Note 4) 1,773,336   2,605,333 2,385,559
Gain on net monetary positions 4,267,194 $ 226 4,429,145  
Other financial cost (5,067,200)   (2,118,755) (3,906,627)
Total $ (7,075,342) $ (375) $ (10,176,316) $ (1,943,760)