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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Impact of Adoption IFRS 15 on Statements of Comprehensive Income (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Operating revenues:        
Revenues services $ 863,647,642 $ 43,878 $ 878,411,323 $ 831,885,365
Operating revenues 1,038,207,681 52,747 1,021,633,535 975,412,488
Operating costs and expenses:        
Cost of sales and services 508,822,430 25,851 496,335,746 485,060,579
Depreciation and amortization 155,712,580 7,911 160,174,942 148,525,921
Operating costs and expenses 898,650,510 45,657 921,490,232 865,802,178
Operating income 139,557,171 7,090 100,143,303 109,610,310
Equity interest in net result of associated companies 267   91,385 189,950
Income tax (46,477,079) (2,361) (24,941,511) (11,398,856)
Non-controlling interests 1,950,626 100 2,829,412 3,429,312
Net profit for the year 54,516,823 $ 2,770 32,155,333 12,078,739
IFRS 15 [member]        
Operating revenues:        
Revenues services 863,647,642      
Sales of equipment 174,560,039      
Operating revenues 1,038,207,681      
Operating costs and expenses:        
Cost of sales and services 508,822,430      
Commercial, administrative and general and other expenses 234,115,500      
Depreciation and amortization 155,712,580      
Operating costs and expenses 898,650,510      
Operating income 139,557,171      
Financial items, net 38,563,536      
Equity interest in net result of associated companies 267      
Income tax 46,477,079      
Non-controlling interests (1,950,626)      
Net profit for the year 52,566,197      
Previous IFRS [member]        
Operating revenues:        
Revenues services 881,530,167   $ 878,411,323 $ 831,885,365
Sales of equipment 158,721,765      
Operating revenues 1,040,251,932      
Operating costs and expenses:        
Cost of sales and services 509,100,174      
Commercial, administrative and general and other expenses 240,010,631      
Depreciation and amortization 155,712,580      
Operating costs and expenses 904,823,385      
Operating income 135,428,547      
Financial items, net 38,356,359      
Equity interest in net result of associated companies 267      
Income tax 45,496,698      
Non-controlling interests (1,950,626)      
Net profit for the year 49,625,131      
Increase/(decrease) [member]        
Operating revenues:        
Revenues services (17,882,525)      
Sales of equipment 15,838,274      
Operating revenues (2,044,251)      
Operating costs and expenses:        
Cost of sales and services (277,744)      
Commercial, administrative and general and other expenses (5,895,131)      
Operating costs and expenses (6,172,875)      
Operating income 4,128,624      
Financial items, net 207,177      
Income tax 980,381      
Net profit for the year $ 2,941,066