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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Plan Assets) (Details) - The company - Funded pension - IDR (Rp) Rp in Billions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Corporate bonds |  |
Plan Assets |  |
Fixed income instruments | Rp 314 | Rp 340
Level 1 |  |
Plan Assets |  |
Cash and cash equivalents | 873 | 1,481
Equity-based mutual fund | 1,336 | 1,233
Total | 13,023 | 14,647
Level 1 | Finance |  |
Plan Assets |  |
Equity instruments | 1,456 | 1,463
Level 1 | Consumer goods |  |
Plan Assets |  |
Equity instruments | 1,336 | 1,411
Level 1 | Infrastructure, utilities and transportation |  |
Plan Assets |  |
Equity instruments | 530 | 656
Level 1 | Construction, property and real estate |  |
Plan Assets |  |
Equity instruments | 199 | 363
Level 1 | Basic industry and chemical |  |
Plan Assets |  |
Equity instruments | 124 | 115
Level 1 | Trading, service and investment |  |
Plan Assets |  |
Equity instruments | 420 | 388
Level 1 | Mining |  |
Plan Assets |  |
Equity instruments | 112 | 92
Level 1 | Agriculture |  |
Plan Assets |  |
Equity instruments | 55 | 46
Level 1 | Miscellaneous industries |  |
Plan Assets |  |
Equity instruments | 362 | 377
Level 1 | Government bonds |  |
Plan Assets |  |
Fixed income instruments | 6,166 | 6,968
Level 1 | Mutual funds |  |
Plan Assets |  |
Fixed income instruments | 54 | 54
Unquoted |  |
Plan Assets |  |
Direct placement | 288 | 237
Property | 178 | 188
Others | 308 | 314
Total | 6,041 | 6,167
Unquoted | Corporate bonds |  |
Plan Assets |  |
Fixed income instruments | Rp 5,267 | Rp 5,428

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