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CASH FLOW – OTHER ITEMS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Cash flow arising from changes in: |  |
Gain on non-hedge derivatives (note 25e) | $ (6) | $ (12)
Stock-based compensation expense | 80 | 82
Income from investment in equity investees (note 16) | (76) | (20)
Change in estimate of rehabilitation costs at closed mines | 55 | 130
Net inventory impairment charges (note 17) | 21 | 68
Change in other assets and liabilities | (196) | (249)
Settlement of rehabilitation obligations | (59) | (62)
Other operating activities | (181) | (63)
Cash flow arising from changes in: |  |
Accounts receivable | 8 | (5)
Inventory | (372) | (190)
Other current assets | (278) | (72)
Accounts payable | (35) | (190)
Other current liabilities | (51) | 29
Change in working capital | $ (728) | $ (428)

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