The plan asset allocation of the investment portfolio was as follows as of December 31, 2017 and 2016:
| December 31, 2017 |
December 31, 2016 |
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Debt instruments |
147 | 142 | ||||||
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Equity instruments |
78 | 64 | ||||||
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Cash and cash equivalents |
25 | 23 | ||||||
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Property |
11 | 9 | ||||||
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Other assets |
10 | 14 | ||||||
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Total plan assets |
271 | 252 | ||||||
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