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FINANCIAL INSTRUMENTS - Derivative Narrative (Details) ozt in Thousands, bbl in Thousands, lb in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) lb $ / pound ozt bbl $ / bbl counterparty | Dec. 31, 2016 USD ($) | Dec. 31, 2017 AUD ($) lb $ / pound ozt bbl $ / bbl counterparty | Dec. 31, 2015 bbl | Dec. 31, 2014 lb | Dec. 31, 2013 AUD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Number of counterparties | counterparty | 18 |  | 18 |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | $ (16) | $ 16 |  |  |  |
Gain (loss) on non-hedge derivatives | 6 | 12 |  |  |  |
Fuel contracts |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Gain (loss) on non-hedge derivatives | 0 | 5 |  |  |  |
Gold and Copper Contracts |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Gain (loss) on non-hedge derivatives | 4 |  |  |  |  |
Gold |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Gain (loss) on non-hedge derivatives | $ 4 | 2 |  |  |  |
Commodity price risk | Fuel contracts |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 206 |  | 206 |  |  |
Commodity price risk | Gold |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 210 |  | 210 |  |  |
Commodity price risk | Gold positions |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 105 |  | 105 |  |  |
Cash flow hedge |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | $ (19) | 25 |  |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | 5 |  |  |  |  |
Interest rate contracts | Cash flow hedge |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | 0 | 0 |  |  |  |
Interest rate contracts | Cash flow hedge | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount | 71 |  |  |  |  |
Currency contracts | Cash flow hedge | Currency risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount |  |  | $ 0 |  |  | $ 990,000,000
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) |  | (14) |  |  |  |
Fuel contracts | Cash flow hedge |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | (8) | $ 23 |  |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | $ 5 |  |  |  |  |
WTI Fuel Contract | Cash flow hedge | Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 840 |  | 840 | 8,040 |  |
Average price of hedging instrument (fuel in USD/barrell; copper in USD/lb) | $ / bbl | 79 |  | 79 |  |  |
Silver | Cash flow hedge | Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | $ 190 |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb |  |  |  |  | 65 |
Hedge ineffectiveness due to changes in original forecasted transaction | 2 |  |  |  |  |
Copper | Cash flow hedge |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax $3 and ($9) | $ (11) |  |  |  |  |
Copper | Cash flow hedge | Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 60 |  | 60 |  |  |
Derivatives purchased during period | lb | 115 |  |  |  |  |
Copper put option contracts | Cash flow hedge | Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Average price of hedging instrument (fuel in USD/barrell; copper in USD/lb) | $ / pound | 2.83 |  | 2.83 |  |  |
Copper call contracts | Cash flow hedge | Commodity price risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Average price of hedging instrument (fuel in USD/barrell; copper in USD/lb) | $ / pound | 3.25 |  | 3.25 |  |  |
Net Asset Position |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Number of counterparties | counterparty | 6 |  | 6 |  |  |
Derivative financial assets (liabilities) | $ 2 |  |  |  |  |
Net Liability Position |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Number of counterparties | counterparty | 12 |  | 12 |  |  |
Derivative financial assets (liabilities) | $ (31) |  |  |  |  |

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