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Finance Expense, Net (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
$ / $
Dec. 31, 2016
MXN ($)
$ / $
Dec. 31, 2015
USD ($)
$ / $
Dec. 31, 2015
MXN ($)
$ / $
Finance Expense, Net        
Interest expense $ (9,245,671) $ (8,497,919)   $ (6,239,387)
Foreign exchange loss, net   (2,490,296)   (2,426,011)
Other finance expense, net   (43,370)    
Finance expense (9,245,671) (11,031,585)   (8,665,398)
Interest income 2,268,711 1,499,473   1,027,758
Foreign exchange gain, net 768,923      
Other finance income, net 903,204     7,514,784
Finance income 3,940,838 1,499,473   8,542,542
Finance expense, net (5,304,833) $ (9,532,112)   $ (122,856)
Fees for the prepayment of Senior Notes due 2018 $ 158,496      
Foreign exchange rate | $ / $ 19.7051 20.6356 17.2160 17.2160
Changes in fair value from embedded derivative       $ 409,196
Adjustments for reclassifications from accumulated other comprehensive income       5,262,577
Reclassification adjustments of changes in fair value available-for-sale financial assets       4,718,175
Reclassification adjustment       544,402
Proceeds from conversion of debentures into warrants     $ 135.1 2,194,981
Interest income from convertible debentures       $ 142,010