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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial instruments (Details) Rp in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 IDR (Rp) | Dec. 31, 2018 USD ($) item | Dec. 31, 2018 IDR (Rp) item | Dec. 31, 2017 IDR (Rp) | Dec. 31, 2016 IDR (Rp) | Dec. 31, 2018 IDR (Rp) | Jan. 01, 2018 IDR (Rp) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 IDR (Rp) | Dec. 31, 2015 IDR (Rp)
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |  |  |  |
Financial liabilities categorized as held for trading |  |  |  |  |  | Rp 0 |  |  | Rp 0 |
Number of stages for recognition of expected credit losses | item |  | 2 | 2 |  |  |  |  |  |  |
Period to trigger provision |  | 12 months | 12 months |  |  |  |  |  |  |
Past due period for significant increased risk |  | 30 days | 30 days |  |  |  |  |  |  |
Period to measure expected credit losses |  | 12 months | 12 months |  |  |  |  |  |  |
Past due period for default |  | 90 days | 90 days |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents. |  | $ 1,212 |  |  | Rp 29,767,000 | 17,435,000 |  | $ 1,747 | 25,145,000 | Rp 28,117,000
Other current financial assets. |  | 91 |  |  |  | 1,314,000 |  |  | 2,173,000 |
Trade and other receivables |  | 690 |  |  |  | 9,928,000 |  |  | 9,564,000 |
Contract assets |  | 108 |  |  |  | 1,560,000 |  |  |  |
Contract costs |  | 64 |  |  |  | 924,000 |  |  |  |
Other current assets |  | 506 |  |  |  | 7,280,000 |  |  | 7,183,000 |
Long-term investments |  | 185 |  |  | 1,847,000 | 2,662,000 |  |  | 2,148,000 |
Assets Recognised From Costs to Obtain or Fulfil Contracts With Customers, Non Current |  | 22 |  |  |  | 320,000 |  |  |  |
Deferred tax assets |  | 172 |  |  |  | 2,477,000 |  |  | 2,804,000 |
Other non-current assets. |  | 672 |  |  |  | 9,654,000 |  |  | 12,270,000 |
LIABILITIES |  |  |  |  |  |  |  |  |  |
Unearned income - current portion |  |  |  |  |  |  |  |  | 5,427,000 |
Contract liabilities - current portion |  | 365 |  |  |  | 5,252,000 |  |  | 5,427,000 |
Unearned income - non-current portion |  |  |  |  |  |  |  |  | 524,000 |
Contract liabilities - non-current portion |  | 45 |  |  |  | 652,000 |  |  | 524,000 |
Deferred tax liabilities |  | 83 |  |  |  | 1,197,000 |  |  | 933,000 |
Long-term loans and other borrowings |  | 2,347 |  |  |  | 33,743,000 |  |  | 27,974,000 |
EQUITY |  |  |  |  |  |  |  |  |  |
Retained earnings |  | 6,362 |  |  |  | 91,488,000 |  |  | 85,285,000 |
Other reserves |  | 22 |  |  |  | 321,000 |  |  | 230,000 |
Non-controlling Interests |  | 1,270 |  |  |  | 18,267,000 |  |  | 19,364,000 |
STATEMENT OF PROFIT OR LOSS |  |  |  |  |  |  |  |  |  |
Revenue | Rp 130,788,000 | 9,095 | Rp 130,788,000 | Rp 128,256,000 | 116,333,000 |  |  |  |  |
Operation, maintenance and telecommunication service expenses | (43,893,000) | (3,052) | (43,893,000) | (36,603,000) | (31,263,000) |  |  |  |  |
Marketing expenses | (4,001,000) | (278) | (4,001,000) | (5,268,000) | (4,132,000) |  |  |  |  |
General and administrative expenses | (6,594,000) | (459) | (6,594,000) | (5,260,000) | (4,610,000) |  |  |  |  |
Gain (loss) on foreign exchange - net | 71,000 | 5 | 71,000 | 51,000 | (52,000) |  |  |  |  |
Other income | 1,745,000 | 121 | 1,745,000 | 1,039,000 | 751,000 |  |  |  |  |
Other expenses | (680,000) | (47) | (680,000) | (1,320,000) | (2,469,000) |  |  |  |  |
Finance costs | (3,523,000) | (245) | (3,523,000) | (2,769,000) | (2,810,000) |  |  |  |  |
Income tax expense – net | (9,366,000) | (652) | (9,366,000) | (9,958,000) | (9,017,000) |  |  |  |  |
OCI |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 148,000 | $ 10 | Rp 148,000 | 24,000 | (40,000) |  |  |  |  |
Net gain on available-for-sale |  |  |  | Rp 20,000 | Rp 0 |  |  |  |  |
Provision for impairment |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents. |  |  |  |  |  |  | Rp (4,000) |  |  |
Trade and other receivables |  |  |  |  |  |  | (4,520,000) |  |  |
Contract assets |  |  |  |  |  |  | (34,000) |  |  |
Previous standards |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents. |  |  |  |  |  | 17,439,000 |  |  |  |
Other current financial assets. |  |  |  |  |  | 1,304,000 |  |  |  |
Trade and other receivables |  |  |  |  |  | 12,141,000 |  |  |  |
Other current assets |  |  |  |  |  | 7,982,000 |  |  |  |
Long-term investments |  |  |  |  |  | 2,472,000 |  |  |  |
Deferred tax assets |  |  |  |  |  | 2,504,000 |  |  |  |
Other non-current assets. |  |  |  |  |  | 9,672,000 |  |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |  |
Unearned income - current portion |  |  |  |  |  | 5,190,000 |  |  |  |
Unearned income - non-current portion |  |  |  |  |  | 652,000 |  |  |  |
Deferred tax liabilities |  |  |  |  |  | 1,252,000 |  |  |  |
Long-term loans and other borrowings |  |  |  |  |  | 33,748,000 |  |  |  |
EQUITY |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 91,396,000 |  |  |  |
Other reserves |  |  |  |  |  | 304,000 |  |  |  |
Non-controlling Interests |  |  |  |  |  | 18,338,000 |  |  |  |
STATEMENT OF PROFIT OR LOSS |  |  |  |  |  |  |  |  |  |
Revenue | 130,784,000 |  |  |  |  |  |  |  |  |
Operation, maintenance and telecommunication service expenses | (43,791,000) |  |  |  |  |  |  |  |  |
Marketing expenses | (4,214,000) |  |  |  |  |  |  |  |  |
General and administrative expenses | (6,137,000) |  |  |  |  |  |  |  |  |
Gain (loss) on foreign exchange - net | 68,000 |  |  |  |  |  |  |  |  |
Other income | 1,752,000 |  |  |  |  |  |  |  |  |
Other expenses | (750,000) |  |  |  |  |  |  |  |  |
Finance costs | (3,507,000) |  |  |  |  |  |  |  |  |
Income tax expense – net | (9,426,000) |  |  |  |  |  |  |  |  |
OCI |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 146,000 |  |  |  |  |  |  |  |  |
Net gain on available-for-sale | (10,000) |  |  |  |  |  |  |  |  |
Previous standards | Provision for impairment |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  |  |  |  |  | Rp (4,335,000) |
IFRS 9 | Provision for impairment |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents. |  |  |  |  |  |  | (4,000) |  |  |
Trade and other receivables |  |  |  |  |  |  | (185,000) |  |  |
Contract assets |  |  |  |  |  |  | (34,000) |  |  |
IFRS 9 & 15 adjustment |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents. |  |  |  |  |  | (4,000) | (4,000) |  |  |
Other current financial assets. |  |  |  |  |  | 10,000 |  |  |  |
Trade and other receivables |  |  |  |  |  | (2,213,000) | (1,507,000) |  |  |
Contract assets |  |  |  |  |  | 1,560,000 | 1,311,000 |  |  |
Contract costs |  |  |  |  |  | 924,000 | 1,096,000 |  |  |
Other current assets |  |  |  |  |  | (702,000) | (666,000) |  |  |
Long-term investments |  |  |  |  |  | 190,000 | 69,000 |  |  |
Assets Recognised From Costs to Obtain or Fulfil Contracts With Customers, Non Current |  |  |  |  |  | 320,000 |  |  |  |
Deferred tax assets |  |  |  |  |  | (27,000) | (82,000) |  |  |
Other non-current assets. |  |  |  |  |  | (18,000) | 27,000 |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |  |
Unearned income - current portion |  |  |  |  |  | (5,190,000) |  |  |  |
Contract liabilities - current portion |  |  |  |  |  | 5,252,000 | 68,000 |  |  |
Unearned income - non-current portion |  |  |  |  |  | (652,000) |  |  |  |
Contract liabilities - non-current portion |  |  |  |  |  | 652,000 |  |  |  |
Deferred tax liabilities |  |  |  |  |  | (55,000) | (82,000) |  |  |
Long-term loans and other borrowings |  |  |  |  |  | (5,000) |  |  |  |
EQUITY |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 92,000 | 315,000 |  |  |
Other reserves |  |  |  |  |  | 17,000 | (27,000) |  |  |
Non-controlling Interests |  |  |  |  |  | Rp (71,000) | Rp (30,000) |  |  |
STATEMENT OF PROFIT OR LOSS |  |  |  |  |  |  |  |  |  |
Revenue | 4,000 |  |  |  |  |  |  |  |  |
Operation, maintenance and telecommunication service expenses | (102,000) |  |  |  |  |  |  |  |  |
Marketing expenses | 213,000 |  |  |  |  |  |  |  |  |
General and administrative expenses | (457,000) |  |  |  |  |  |  |  |  |
Gain (loss) on foreign exchange - net | 3,000 |  |  |  |  |  |  |  |  |
Other income | (7,000) |  |  |  |  |  |  |  |  |
Other expenses | 70,000 |  |  |  |  |  |  |  |  |
Finance costs | (16,000) |  |  |  |  |  |  |  |  |
Income tax expense – net | 60,000 |  |  |  |  |  |  |  |  |
OCI |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 2,000 |  |  |  |  |  |  |  |  |
Net gain on available-for-sale | Rp 10,000 |  |  |  |  |  |  |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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