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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details)	12 Months Ended
	Dec. 31, 2021
Buildings | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	15 years
Buildings | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	50 years
Leasehold improvements | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	2 years
Leasehold improvements | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	15 years
Switching equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	3 years
Switching equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	15 years
Telegraph, telex and data communication equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	5 years
Telegraph, telex and data communication equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	15 years
Transmission installation and equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	3 years
Transmission installation and equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	30 years
Satellite, earth station and equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	3 years
Satellite, earth station and equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	20 years
Cable network | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	5 years
Cable network | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	25 years
Power supply | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	3 years
Power supply | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	20 years
Data processing equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	3 years
Data processing equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	20 years
Vehicles | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	4 years
Vehicles | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	8 years
Other telecommunication peripherals
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	5 years
Office equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	2 years
Office equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	5 years
Other equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	2 years
Other equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT, NET
Estimated useful lives of property and equipment	5 years

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2021-01-01
-Paragraph 73
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_c&doctype=Standard
-URIDate 2021-03-24

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