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Right of use assets and lease debt - Schedule of detailed information about right-of-use assets and lease liabilities (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($)
Disclosure Right of use Assets and Lease liabilities [Line Items] |  |  |
As of January 1 | $ 118,003,223 |  |
As of January 1 | 118,003,223 |  | $ 120,078,302
Additions and release | 7,569,964 |  | 8,015,051
Business Combinations |  |  | 9,668,507
Modifications | 6,572,362 |  | 9,492,280
Depreciation | (28,371,085) |  | (23,593,566)
Translation adjustment | (1,797,620) |  | (5,657,351)
Balance at December 31 | 101,976,844 | $ 5,112 | 118,003,223
Interest expense | 9,134,288 |  | 7,940,240
Payments | (29,623,565) | $ (1,485) | (26,765,075)
Balance at December 31 | 109,327,241 |  |
Towers and sites [member] |  |  |
Disclosure Right of use Assets and Lease liabilities [Line Items] |  |  |
As of January 1 | 96,102,449 |  | 94,252,098
Additions and release | 5,745,869 |  | 6,364,508
Business Combinations |  |  | 9,668,507
Modifications | 8,559,335 |  | 7,474,469
Depreciation | (22,064,413) |  | (17,286,497)
Translation adjustment | (3,124,365) |  | (4,370,636)
Balance at December 31 | 85,218,875 |  | 96,102,449
Property [member] |  |  |
Disclosure Right of use Assets and Lease liabilities [Line Items] |  |  |
As of January 1 | 17,439,370 |  | 21,075,884
Additions and release | 309,576 |  | 921,542
Modifications | (3,035,831) |  | 1,288,974
Depreciation | (3,440,428) |  | (4,941,222)
Translation adjustment | 932,748 |  | (905,808)
Balance at December 31 | 12,205,435 |  | 17,439,370
Office equipment [member] |  |  |
Disclosure Right of use Assets and Lease liabilities [Line Items] |  |  |
As of January 1 | 4,461,404 |  | 4,750,320
Additions and release | 1,514,519 |  | 729,001
Modifications | 1,048,858 |  | 728,837
Depreciation | (2,866,244) |  | (1,365,847)
Translation adjustment | 393,997 |  | (380,907)
Balance at December 31 | 4,552,534 |  | 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 | 120,596,733 |  | 119,387,660
Additions and release | 4,833,959 |  | 7,437,621
Business Combinations |  |  | 10,810,111
Modifications | 7,769,326 |  | 8,363,045
Interest expense | 9,134,288 |  | 7,940,240
Payments | (29,623,565) |  | (26,765,075)
Translation adjustment | (3,383,500) |  | (6,576,869)
Balance at December 31 | $ 109,327,241 |  | $ 120,596,733

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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