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OTHER ASSETS | 12 Months Ended
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Dec. 31, 2016
Other Assets [Abstract] |
Other Assets Disclosure | OTHER ASSETS The components of other assets follow:
| December 31,
| 2016 |  | 2015
Disputed tax assessments: a |  |  |
PT-FI | $ | 331 |  |  | $ | 209 |
Cerro Verde | 277 |  |  | 245 |
Intangible assetsb | 305 |  |  | 316 |
Investments: |  |  |
Assurance bondc | 120 |  |  | 118 |
PT Smeltingd | 83 |  |  | 112 |
Available-for-sale securities | 50 |  |  | 47 |
Other | 50 |  |  | 50 |
Contingent consideration associated with sales of assetse | 196 |  |  | — |
Legally restricted fundsf | 182 |  |  | 171 |
Long-term receivable for taxesg | 129 |  |  | 261 |
Rio Tinto's share of ARO | 71 |  |  | 49 |
Long-lead equipment | 17 |  |  | 187 |
Deferred drillship costs | — |  |  | 81 |
Other | 145 |  |  | 141 |
Total other assets | $ | 1,956 |  |  | $ | 1,987 |
a. | Refer to Note 12 for further discussion.
b. | Intangible assets were net of accumulated amortization totaling $37 million at December 31, 2016, and $61 million at December 31, 2015.
c. | Relates to PT-FI's commitment for smelter development in Indonesia (refer to Note 13 for further discussion).
d. | FCX'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 $39 million at December 31, 2016, and $14 million at December 31, 2015. Trade accounts receivable from PT Smelting totaled $283 million at December 31, 2016, and $160 million at December 31, 2015.
e. | Refer to Note 2 for further discussion.
f. | Includes $173 million at December 31, 2016, and $169 million at December 31, 2015, held in trusts for AROs related to properties in New Mexico (refer to Note 12 for further discussion).
g. | Includes tax overpayments and refunds not expected to be realized within the next 12 months (primarily at PT-FI and Cerro Verde).

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