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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, 2017 | Dec. 31, 2016
--- | --- | ---
Corporate bonds |  |
Plan Assets |  |
Fixed income instruments | Rp 340 | Rp 311
Level 1 |  |
Plan Assets |  |
Cash and cash equivalents | 1,481 | 1,064
Equity-based mutual fund | 1,233 | 1,296
Total | 14,647 | 14,566
Level 1 | Finance |  |
Plan Assets |  |
Equity instruments | 1,463 | 1,039
Level 1 | Consumer goods |  |
Plan Assets |  |
Equity instruments | 1,411 | 1,206
Level 1 | Infrastructure, utilities and transportation |  |
Plan Assets |  |
Equity instruments | 656 | 536
Level 1 | Construction, property and real estate |  |
Plan Assets |  |
Equity instruments | 363 | 577
Level 1 | Basic industry and chemical |  |
Plan Assets |  |
Equity instruments | 115 | 130
Level 1 | Trading, service and investment |  |
Plan Assets |  |
Equity instruments | 388 | 216
Level 1 | Mining |  |
Plan Assets |  |
Equity instruments | 92 | 62
Level 1 | Agriculture |  |
Plan Assets |  |
Equity instruments | 46 | 71
Level 1 | Miscellaneous industries |  |
Plan Assets |  |
Equity instruments | 377 | 361
Level 1 | Government bonds |  |
Plan Assets |  |
Fixed income instruments | 6,968 | 7,978
Level 1 | Mutual funds |  |
Plan Assets |  |
Fixed income instruments | 54 | 30
Unquoted |  |
Plan Assets |  |
Direct placement | 188 | 188
Property | 237 | 174
Others | 314 | 301
Total | 6,167 | 4,480
Unquoted | Corporate bonds |  |
Plan Assets |  |
Fixed income instruments | Rp 5,428 | Rp 3,817

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