XML 358 R96.htm IDEA: XBRL DOCUMENT
v3.21.1

Accounting Policies - Summary of Significant Assumptions Used in the Group's Impairment Assessments (FVLCOD calculations) (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 Exchange_Rates T | Dec. 31, 2019 Exchange_Rates T | Dec. 31, 2018 Exchange_Rates $ / per_oz $ / per_oz ZAR-kg T | Dec. 31, 2020 $ / per_oz | Dec. 31, 2020 $ / per_oz | Dec. 31, 2020 ZAR-kg | Dec. 31, 2020 $ / oz | Dec. 31, 2019 $ / per_oz | Dec. 31, 2019 $ / per_oz | Dec. 31, 2019 ZAR-kg | Dec. 31, 2019 $ / oz
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  |  |  | 76 |  |  |  | 70 |  |
Nominal discount rate | 8.40% | 8.50% |  |  |  |  |  |  |  |  |
Life of mine | 7 years | 10 years |  |  |  |  |  |  |  |  |
South deep [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 86 years | 75 years | 75 years |  |  |  |  |  |  |  |
Tarkwa [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 14 years | 14 years | 14 years |  |  |  |  |  |  |  |
Damang [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 5 years | 6 years | 7 years |  |  |  |  |  |  |  |
Cerro Cerona [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 10 years | 13 years | 12 years |  |  |  |  |  |  |  |
St Ives [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 8 years | 9 years | 7 years |  |  |  |  |  |  |  |
Agnew [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 5 years | 4 years | 4 years |  |  |  |  |  |  |  |
Granny Smith [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 10 years | 13 years | 12 years |  |  |  |  |  |  |  |
Gruyere [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 9 years | 11 years | 12 years |  |  |  |  |  |  |  |
Salares Norte [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Life of mine | 12 years |  |  |  |  |  |  |  |  |  |
Rand [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  | 17 |  | 6 |  |  |  | 16 |  |
Nominal discount rate | 14.50% | 14.10% | 13.50% |  |  |  |  |  |  |  |
Inflation rate | 4.70% | 5.30% | 5.50% |  |  |  |  |  |  |  |
Australia, Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  | 28 |  | 88 |  |  |  | 77 |  |
Real discount rates | 3.50% | 3.50% | 3.40% |  |  |  |  |  |  |  |
Ghanaian cedi [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  | 44 |  | 76 |  |  |  | 70 |  |
Real discount rates | 8.40% | 8.50% | 9.50% |  |  |  |  |  |  |  |
Peru, Nuevos Soles [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  | 70 |  | 34 |  |  |  | 34 |  |
Real discount rates | 4.50% | 5.00% | 4.90% |  |  |  |  |  |  |  |
Chile, Pesos [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Resource value per ounce |  |  |  |  | 4 |  |  |  |  |  |
Real discount rates | 6.00% |  |  |  |  |  |  |  |  |  |
Year 1 [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,200 |  | 1,600 |  |  |  | 1,500 |  |
Copper price per tonne | T | 5,797 | 5,730 | 5,951 |  |  |  |  |  |  |  |
Year 1 [member] | Rand [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price | ZAR-kg |  |  | 525,000 |  |  | 900,000 |  |  |  | 700,000 |
Long-term exchange rates | Exchange_Rates | 17.50 | 14.50 | 13.61 |  |  |  |  |  |  |  |
Year 1 [member] | Australia, Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,600 | 2,190 |  |  |  | 2,150 |  |  |
Long-term exchange rates | Exchange_Rates | 0.76 | 0.70 | 0.75 |  |  |  |  |  |  |  |
Year 2 [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,300 |  | 1,700 |  |  |  | 1,400 |  |
Copper price per tonne | T | 6,612 | 6,612 | 6,612 |  |  |  |  |  |  |  |
Year 2 [member] | Rand [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price | ZAR-kg |  |  | 550,000 |  |  | 850,000 |  |  |  | 650,000 |
Long-term exchange rates | Exchange_Rates | 15.55 | 14.50 | 13.16 |  |  |  |  |  |  |  |
Year 2 [member] | Australia, Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,700 | 2,300 |  |  |  | 1,970 |  |  |
Long-term exchange rates | Exchange_Rates | 0.74 | 0.71 | 0.76 |  |  |  |  |  |  |  |
Year 3 [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,300 |  | 1,600 |  |  |  | 1,400 |  |
Year 3 [member] | Rand [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price | ZAR-kg |  |  | 550,000 |  |  | 800,000 |  |  |  | 650,000 |
Year 3 [member] | Australia, Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,700 | 2,200 |  |  |  | 1,970 |  |  |
Long-term exchange rates | Exchange_Rates | 0.73 | 0.71 | 0.76 |  |  |  |  |  |  |  |
Year 4 [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,300 |  | 1,500 |  | 1,500 |  | 1,350 |  | 1,350
Year 4 [member] | Rand [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price | ZAR-kg |  |  | 550,000 |  |  | 750,000 |  |  |  | 630,000 |
Year 4 [member] | Australia, Dollars [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |  |
Gold price |  |  | 1,700 | 2,000 |  |  |  | 1,850 |  |  |
Long-term exchange rates | Exchange_Rates | 0.75 | 0.73 | 0.76 |  |  |  |  |  |  |  |

X
- Definition Inflation rate. + References No definition available. + Details
Name: | gfi_InflationRate
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Life Time For Mines + References No definition available. + Details
Name: | gfi_LifeTimeForMines
Namespace Prefix: | gfi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long term copper price. + References No definition available. + Details
Name: | gfi_LongTermCopperPrice
Namespace Prefix: | gfi_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

X
- Definition Long term exchange rates. + References No definition available. + Details
Name: | gfi_LongTermExchangeRates
Namespace Prefix: | gfi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long term gold price. + References No definition available. + Details
Name: | gfi_LongTermGoldPrice
Namespace Prefix: | gfi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Nominal discount rate used to measure fair value of long term gold price. + References No definition available. + Details
Name: | gfi_NominalDiscountRate
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real discount rate. + References No definition available. + Details
Name: | gfi_RealDiscountRate
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Resource value per ounce. + References No definition available. + Details
Name: | gfi_ResourceValuePerOunce
Namespace Prefix: | gfi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfChangesInAccountingEstimatesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_SouthDeepMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_TarkwaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_DamangMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_CerroCeronaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_StivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_AgnewMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_GrannySmithMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_GruyereMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=gfi_SalaresNorteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_ZAR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GHS
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_PEN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CLP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=gfi_YearOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=gfi_YearTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=gfi_YearThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=gfi_YearFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |