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OTHER ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Assets [Abstract] |
Schedule of Other Assets | The components of other assets follow:
| December 31,
| 2017 |  | 2016
Disputed tax assessments:a |  |  |
PT-FI | $ | 417 |  |  | $ | 331 |
Cerro Verde | 185 |  |  | 277 |
Long-term receivable for taxes b | 445 |  |  | 129 |
Intangible assets c | 306 |  |  | 305 |
Investments: |  |  |
Assurance bond d | 123 |  |  | 120 |
PT Smelting e | 61 |  |  | 83 |
Available-for-sale securities | 30 |  |  | 50 |
Other | 48 |  |  | 50 |
Contingent consideration associated with sales of assets f | 234 |  |  | 196 |
Legally restricted funds g | 189 |  |  | 182 |
Rio Tinto’s share of ARO | 68 |  |  | 71 |
Long-term employee receivables | 20 |  |  | 32 |
Other | 144 |  |  | 130 |
Total other assets | $ | 2,270 |  |  | $ | 1,956 |
a. | Refer to Note 12 for further discussion.
b. | Includes tax overpayments and refunds not expected to be realized within the next 12 months (primarily in the U.S. associated with U.S. tax reform, refer to Note 11).
c. | Indefinite-lived intangible assets totaled $215 million at December 31, 2017, and $217 million at December 31, 2016. Definite-lived intangible assets were net of accumulated amortization totaling $46 million at December 31, 2017, and $37 million at December 31, 2016.
d. | Relates to PT-FI’s commitment for smelter development in Indonesia (refer to Note 13 for further discussion).
e. | PT-FI’s 25 percent ownership in PT Smelting (smelter and refinery in Gresik, Indonesia) is recorded using the equity method. Amounts were reduced by unrecognized profits on sales from PT-FI to PT Smelting totaling $68 million at December 31, 2017, and $39 million at December 31, 2016. Trade accounts receivable from PT Smelting totaled $308 million at December 31, 2017, and $283 million at December 31, 2016.
f. | Refer to Note 2 for further discussion.
g. | Includes $180 million at December 31, 2017, and $173 million at December 31, 2016, held in trusts for AROs related to properties in New Mexico (refer to Note 12 for further discussion).

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