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OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES (Details) $ in Millions, Rp in Billions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 IDR (Rp)	Dec. 31, 2019 IDR (Rp)	Dec. 31, 2018 IDR (Rp)
OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES
Operation and maintenance		Rp 19,956	Rp 20,417	Rp 25,215
Radio frequency usage charges (Note 34c.i & 34c.ii)		5,930	5,736	5,473
Leased lines and CPE		3,353	4,709	5,125
Concession fees and USO charges		2,411	2,370	2,297
Electricity, gas and water		946	1,102	1,051
Project management		538	460	647
Cost of SIM cards and vouchers (Note 8)		487	645	866
Insurance		378	246	193
Vehicles rental and supporting facilities		334	386	413
Cost of sales of peripherals (Note 8)		57	1,109	1,860
Tower leases				480
Others (each below Rp75 billion)		185	273	273
Total	$ 2,461	Rp 34,575	Rp 37,453	Rp 43,893

X

- Definition

The amount of expense arising from purchased insurance.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense arising from transportation services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense arising from concession fees and USO charges.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of cost of sales of peripherals.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from cost of SIM cards and vouchers.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from utilizing electricity, gas and water.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from leased lines and customer premises equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of miscellaneous other expenses.

+ References

No definition available.

+ Details

Name:	tlk_MiscellaneousOtherExpense
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense arising from operation and maintenance.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense relating to the Operation, maintenance and telecommunication service expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount expense relating to project management.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from radio frequency usage charges.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from tower leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration