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Right of use assets and lease debt - Schedule of detailed information about right-of-use assets and lease liabilities (Detail) - 12 months ended Dec. 31, 2019
$ in Thousands, $ in Millions
MXN ($)
USD ($)
Disclosure Right of use Assets and Lease liabilities [Line Items]    
As of January 1, 2019 $ 0  
As of January 1, 2019 120,078,302  
Additions and release 8,015,051  
Business Combinations 9,668,507  
Modifications 9,492,280  
Depreciation (23,593,566)  
Interest expense 0  
Payments 0  
Translation adjustment (5,657,351)  
Balance at December 31, 2019 118,003,223 $ 6,262
Interest expense 7,940,240  
Payments (26,765,075) $ (1,420)
Balance at December 31, 2019 120,596,733  
Towers and sites [member]    
Disclosure Right of use Assets and Lease liabilities [Line Items]    
As of January 1, 2019 94,252,098  
Additions and release 6,364,508  
Business Combinations 9,668,507  
Modifications 7,474,469  
Depreciation (17,286,497)  
Interest expense 0  
Payments 0  
Translation adjustment (4,370,636)  
Balance at December 31, 2019 96,102,449  
Property [member]    
Disclosure Right of use Assets and Lease liabilities [Line Items]    
As of January 1, 2019 21,075,884  
Additions and release 921,542  
Modifications 1,288,974  
Depreciation (4,941,222)  
Interest expense 0  
Payments 0  
Translation adjustment (905,808)  
Balance at December 31, 2019 17,439,370  
Office equipment [member]    
Disclosure Right of use Assets and Lease liabilities [Line Items]    
As of January 1, 2019 4,750,320  
Additions and release 729,001  
Modifications 728,837  
Depreciation (1,365,847)  
Interest expense 0  
Payments 0  
Translation adjustment (380,907)  
Balance at December 31, 2019 4,461,404  
Liability related to right-of-use of assets [member]    
Disclosure Right of use Assets and Lease liabilities [Line Items]    
As of January 1, 2019 119,387,660  
Additions and release 7,437,621  
Business Combinations 10,810,111  
Modifications 8,363,045  
Depreciation 0  
Interest expense 7,940,240  
Payments (26,765,075)  
Translation adjustment (6,576,869)  
Balance at December 31, 2019 $ 120,596,733