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Other Income and Expenses - Summary of other income and expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Other income:        
Gain on sale of long-lived assets $ 322   $ 324 $ 233
Cancellation of contingencies 268   329 255
Tax Recovery from previous year 597   603 20
Philippines consolidation impact (Note 4) 2,996      
Other 188   25 112
Other income 4,371 $ 223 1,281 620
Other expenses:        
Provisions for contingencies 943   819 334
Loss on the retirement of long-lived assets 174   321 332
Loss on sale of long-lived assets 368   358 16
Non-income taxes from Colombia     48 55
Severance payments 302   13 285
Donations 83   54 221
Foreign exchange losses related to operating activities 2,646   2,799 871
Venezuela impact (Note 3.3) 28,176      
Other 340   681 254
Other expenses $ 33,032 $ 1,682 $ 5,093 $ 2,368