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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Plan Assets (Details) - Post-employment health care benefit cost - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value of plan assets [line items]
Percentage of companies share in total plan assets	2.03%	2.04%
Actual return on plan asset	Rp (315)	Rp 1,748
Level 1
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	1,115	1,354
Equity-based mutual fund	1,204	1,113
Fixed income instruments	7,020	7,642
Total	11,893	12,732
Unquoted
Disclosure of fair value of plan assets [line items]
Private placement	335	297
Total	335	297
Manufacturing and consumer | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	799	835
Finance | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	799	840
Construction | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	190	254
Infrastructure and telecommunication | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	332	350
Wholesale | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	177	137
Mining | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	77	65
Services | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	60	38
Agriculture | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	32	35
Biotechnology and pharma industry | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	85	68
Miscellaneous industries | Level 1
Disclosure of fair value of plan assets [line items]
Equity instruments	3	1
Series B shares
Disclosure of fair value of plan assets [line items]
Equity instruments	Rp 249	Rp 265

X

- Definition

The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount that instruments representing debt (rather than equity) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The amount that direct placement constitute of the fair value of defined benefit plan assets.

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The amount that equity based mutual fund constitute of the fair value of defined benefit plan assets.

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The percentage of equity instruments contributed to fair value of plan assets.

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