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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, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of detailed information about financial instruments [abstract]        
Gain (loss) in valuation of derivatives, net $ 8,192,567   $ (9,622,233) $ 15,128,269
Capitalized interest expense (Note 10 d) 2,875,034   2,861,307 3,524,841
Commissions (1,263,701)   (2,034,972) (1,399,479)
Interest cost of labor obligations (Note 17) (8,722,611)   (9,178,513) (5,701,622)
Interest expense on taxes (1,503,981)   (245,922) (135,569)
Dividend received 2,385,559   5,740,092 1,645,712
Loss on partial sale of shares in associated Company       (545)
Gain on de-recognition of equity method investment (Note 12)       11,988,038
Other financial cost (3,906,627)   (3,745,600) (3,553,329)
Valuation of derivatives and other financial items $ (1,943,760) $ (98) $ (16,225,841) $ 21,496,316