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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, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of detailed information about financial instruments [abstract]        
(Loss) gain in valuation of derivatives, net $ (4,686,407)   $ 8,192,567 $ (9,622,233)
Capitalized interest expense (Note 10 d) 2,020,288   2,875,034 2,861,307
Commissions (1,901,473)   (1,263,701) (2,034,972)
Interest cost of labor obligations (Note 17) (9,968,526)   (8,722,611) (9,178,513)
Interest expense on taxes (555,921)   (1,503,981) (245,922)
Dividend received (Note 4) 2,605,333   2,385,559 5,740,092
Gain on net monetary positions (Note 2i, c) 4,429,145 $ 225    
Other financial cost (2,118,755)   (3,906,627) (3,745,600)
Valuation of derivatives and other financial items $ (10,176,316) $ (517) $ (1,943,760) $ (16,225,841)