Property, Plant and Equipment, net - Additional Information (Details) (Detail) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Methods used to determine stage of completion of construction in progress	The completion period of construction in progress is variable and depends upon the type of plant and equipment under construction.
Land and buildings and other equipment [member] \| Claro Brasil [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment, pledged in guarantee of legal proceedings		$ 3,166,882

The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 74
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_74_a&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant