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CASH FLOW – OTHER ITEMS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flow arising from changes in: |  |
(Gain) loss on non-hedge derivatives | $ (10,000,000) | $ 0
Stock-based compensation expense | 87,000,000 | 71,000,000
Gain on warrant investments at FVPL | 9,000,000 | 0
Income from investment in equity investees (note 16) | (288,000,000) | (165,000,000)
Increase in estimate of rehabilitation costs at closed mines | 90,000,000 | 5,000,000
Net inventory impairment charges (note 17) | 29,000,000 | 26,000,000
Gain on remeasurement of silver sale liability | (104,000,000) | (628,000,000)
Gains (losses) on litigation settlements | 0 | (216,000,000)
Change in other assets and liabilities | (70,000,000) | (113,000,000)
Settlement of rehabilitation obligations | (106,000,000) | (93,000,000)
Other operating activities | (381,000,000) | (1,113,000,000)
Cash flow arising from changes in: |  |
Accounts receivable | (192,000,000) | (118,000,000)
Inventory | 121,000,000 | 9,000,000
Other current assets | (133,000,000) | (89,000,000)
Accounts payable | 42,000,000 | (108,000,000)
Other current liabilities | (146,000,000) | (51,000,000)
Change in working capital | (308,000,000) | (357,000,000)
Dividends received from investments accounted for using equity method, classified as investing activities | 141,000,000 | 125,000,000
Cash repayments of advances and loans from related parties | 79,000,000 | 92,000,000
Funding of equity method investments (note 16) | 0 | (2,000,000)
Other | 0 | (2,000,000)
Other investing activities | 220,000,000 | 213,000,000
Proceeds from issue of bonds, notes and debentures | 42,000,000 | 0
Debt extinguishment costs | (15,000,000) | (3,000,000)
Miscellaneous Other Inflows (Outflows) Of Cash Classified As Financing Activities | 1,000,000 | 2,000,000
Other financing activities (note 15) | $ 28,000,000 | $ (1,000,000)

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