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Other Income and Expenses - Summary of other income and expenses (Detail)
$ in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
MXN ($)
Sep. 30, 2018
MXN ($)
Other income:      
Gain on sale of long-lived assets   $ 269 $ 190
Cancellation of contingencies   84 116
Leases   6  
Foreign Exchange gain related to operating activities   6 96
Tax actualization effects   896  
Other     5
Other income $ 64 1,261 407
Other expenses:      
Provisions for contingencies   627 619
Loss on the retirement of long-lived assets   198 82
Loss on sale of long-lived assets   231 127
Severance payments   1,058 99
Donations   11 117
Leases   6  
Other   99 200
Other expenses $ 113 $ 2,230 $ 1,244