Derivative Financial Assets - Disclosure of Open Position at the Reporting Date (Details) oz in Thousands, R / kg in Thousands, $ in Millions | Jun. 30, 2018USD ($)R / $R / kg$ / ozoz$ / R |
Rand gold hedging contracts | Cash flow hedges | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 300 |
Price of hedging instrument | R / kg | 639 |
Rand gold hedging contracts | Cash flow hedges | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 54 |
Price of hedging instrument | R / kg | 697 |
Rand gold hedging contracts | Cash flow hedges | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 51 |
Price of hedging instrument | R / kg | 621 |
Rand gold hedging contracts | Cash flow hedges | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 53 |
Price of hedging instrument | R / kg | 630 |
Rand gold hedging contracts | Cash flow hedges | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 41 |
Price of hedging instrument | R / kg | 614 |
Rand gold hedging contracts | Cash flow hedges | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 43 |
Price of hedging instrument | R / kg | 622 |
Rand gold hedging contracts | Cash flow hedges | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 34 |
Price of hedging instrument | R / kg | 643 |
Rand gold hedging contracts | Cash flow hedges | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 15 |
Price of hedging instrument | R / kg | 631 |
Rand gold hedging contracts | Cash flow hedges | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 9 |
Price of hedging instrument | R / kg | 655 |
Zero cost collars | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 252 |
Zero cost collars | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 13.69 |
Zero cost collars | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.54 |
Zero cost collars | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 94 |
Zero cost collars | FY19 Q1 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.09 |
Zero cost collars | FY19 Q1 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.09 |
Zero cost collars | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 53 |
Zero cost collars | FY19 Q2 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.14 |
Zero cost collars | FY19 Q2 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.08 |
Zero cost collars | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 45 |
Zero cost collars | FY19 Q3 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 13.14 |
Zero cost collars | FY19 Q3 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 13.80 |
Zero cost collars | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 60 |
Zero cost collars | FY19 Q4 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 13.09 |
Zero cost collars | FY19 Q4 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 13.77 |
Zero cost collars | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 0 |
Zero cost collars | FY20 Q1 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q1 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 0 |
Zero cost collars | FY20 Q2 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q2 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 0 |
Zero cost collars | FY20 Q3 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q3 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 0 |
Zero cost collars | FY20 Q4 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Zero cost collars | FY20 Q4 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | R / $ | 0 |
Forward contracts | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 273 |
Price of derivative instrument at fair value through profit and loss | $ / R | 13.95 |
Forward contracts | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 8 |
Price of derivative instrument at fair value through profit and loss | $ / R | 13.55 |
Forward contracts | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 59 |
Price of derivative instrument at fair value through profit and loss | $ / R | 13.50 |
Forward contracts | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 69 |
Price of derivative instrument at fair value through profit and loss | $ / R | 13.63 |
Forward contracts | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 65 |
Price of derivative instrument at fair value through profit and loss | $ / R | 13.76 |
Forward contracts | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 18 |
Price of derivative instrument at fair value through profit and loss | $ / R | 14.59 |
Forward contracts | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 18 |
Price of derivative instrument at fair value through profit and loss | $ / R | 14.76 |
Forward contracts | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 18 |
Price of derivative instrument at fair value through profit and loss | $ / R | 14.94 |
Forward contracts | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, notional amount | $ | $ 18 |
Price of derivative instrument at fair value through profit and loss | $ / R | 15.12 |
US gold derivative contracts | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 96 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,318 |
US gold derivative contracts | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 24 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,288 |
US gold derivative contracts | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 24 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,291 |
US gold derivative contracts | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 20 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,335 |
US gold derivative contracts | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 18 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,338 |
US gold derivative contracts | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 6 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,370 |
US gold derivative contracts | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 4 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 1,400 |
US gold derivative contracts | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 0 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US gold derivative contracts | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 0 |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
Gold derivative contracts | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 396 |
Gold derivative contracts | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 78 |
Gold derivative contracts | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 75 |
Gold derivative contracts | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 73 |
Gold derivative contracts | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 59 |
Gold derivative contracts | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 49 |
Gold derivative contracts | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 38 |
Gold derivative contracts | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 15 |
Gold derivative contracts | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 9 |
US silver derivative contracts | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 750 |
US silver derivative contracts | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.19 |
US silver derivative contracts | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.19 |
US silver derivative contracts | FY19 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 240 |
US silver derivative contracts | FY19 Q1 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.10 |
US silver derivative contracts | FY19 Q1 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.10 |
US silver derivative contracts | FY19 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 240 |
US silver derivative contracts | FY19 Q2 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.10 |
US silver derivative contracts | FY19 Q2 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.10 |
US silver derivative contracts | FY19 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 90 |
US silver derivative contracts | FY19 Q3 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.30 |
US silver derivative contracts | FY19 Q3 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.30 |
US silver derivative contracts | FY19 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 90 |
US silver derivative contracts | FY19 Q4 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.30 |
US silver derivative contracts | FY19 Q4 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.30 |
US silver derivative contracts | FY20 Q1 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 90 |
US silver derivative contracts | FY20 Q1 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.40 |
US silver derivative contracts | FY20 Q1 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.40 |
US silver derivative contracts | FY20 Q2 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 0 |
US silver derivative contracts | FY20 Q2 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US silver derivative contracts | FY20 Q2 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US silver derivative contracts | FY20 Q3 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 0 |
US silver derivative contracts | FY20 Q3 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US silver derivative contracts | FY20 Q3 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US silver derivative contracts | FY20 Q4 | |
Disclosure of detailed information about financial instruments [line items] | |
Derivative, nonmonetary notional amount (oz) | 0 |
US silver derivative contracts | FY20 Q4 | Floor | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |
US silver derivative contracts | FY20 Q4 | Cap | |
Disclosure of detailed information about financial instruments [line items] | |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0 |