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CASH AND CASH EQUIVALENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and cash equivalents [abstract] |
Disclosure of cash and cash equivalents |
US$ MILLIONS |  | 2018 |  | 2017
Cash |  | $ | 294 |  |  | $ | 258 |
Cash equivalents(1) |  | 150 |  |  | 83 |
Restricted cash(2) |  | 96 |  |  | 33 |
Total cash and cash equivalents |  | $ | 540 |  |  | $ | 374 |
(1) | Short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value.

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