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Segment Information - Geographical segment information (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Geographical segment information:      
Total Net Sales $ 94,274,235 $ 96,287,363 $ 88,051,829
Assets 297,220,101 309,054,150  
Additions to Property, Plant and Equipment 16,759,566 27,941,585 25,703,069
Mexico      
Geographical segment information:      
Total Net Sales 81,308,749 82,340,312 75,926,603
Additions to Property, Plant and Equipment 16,709,852 27,836,033 25,290,033
Other countries      
Geographical segment information:      
Total Net Sales 12,965,486 13,947,051 12,125,226
Additions to Property, Plant and Equipment 49,714 105,552 413,036
Operating segment      
Geographical segment information:      
Total Net Sales 97,618,429 99,347,787 90,198,748
Assets 224,999,871 237,712,519 217,007,753
Operating segment | Mexico      
Geographical segment information:      
Assets 219,206,662 229,472,576 208,022,938
Operating segment | Other countries      
Geographical segment information:      
Assets $ 5,793,209 $ 8,239,943 $ 8,984,815