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LONG-TERM LOANS AND OTHER BORROWINGS - Two-step loans (Details) ¥ in Millions, $ in Millions, Rp in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 JPY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 IDR (Rp) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 IDR (Rp)
Borrowings and other credit facilities |  |  |  |  |  |
Current maturities |  |  | Rp (6,296) |  |  | Rp (5,209)
Long-term portion |  | $ 2,347 | 33,743 |  |  | 27,974
Two-step loans |  |  |  |  |  |
Borrowings and other credit facilities |  |  |  |  |  |
Total loans and other borrowings |  |  | 949 |  |  | 1,098
Current maturities |  |  | (198) |  |  | (206)
Long-term portion |  |  | 751 |  |  | 892
Projected net revenue to projected debt service ratio | 1.2 |  |  |  |  |
Internal financing exceeding annual average capital expenditure | 20.00% |  |  |  |  |
Yen | Two-step loans |  |  |  |  |  |
Borrowings and other credit facilities |  |  |  |  |  |
Total loans and other borrowings | ¥ 4,607 |  | Rp 602 | ¥ 5,375 |  | 648
Interest rate (as a percent) | 2.95% | 2.95% | 2.95% |  |  |
USD | Two-step loans |  |  |  |  |  |
Borrowings and other credit facilities |  |  |  |  |  |
Total loans and other borrowings |  | $ 13 | Rp 188 |  | $ 17 | 237
Interest rate (as a percent) | 3.85% | 3.85% | 3.85% |  |  |
Rupiah | Two-step loans |  |  |  |  |  |
Borrowings and other credit facilities |  |  |  |  |  |
Total loans and other borrowings |  |  | Rp 159 |  |  | Rp 213
Interest rate (as a percent) | 7.50% | 7.50% | 7.50% |  |  |

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