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Newmont Equity and Income (Loss) Per Share - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Feb. 29, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares - convertible notes 3,000,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities      
Payment of Conversion Premium in Cash       $ 172nem_PaymentOfConversionPremiumInCash
Common stock, shares issued   499,000,000us-gaap_CommonStockSharesIssued 493,000,000us-gaap_CommonStockSharesIssued  
Convertible Senior Notes Net Of Discount 2014 And 2017 [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Convertible notes   1,150us-gaap_ConvertibleDebt
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotesNetOfDiscountTwentyFourteenAndTwentySeventeenMember
   
Principal amount   $ 575us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotesNetOfDiscountTwentyFourteenAndTwentySeventeenMember
   
Conversion price on convertible notes   $ 44.05us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotesNetOfDiscountTwentyFourteenAndTwentySeventeenMember
   
Convertible notes common stock   13,053,348us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotesNetOfDiscountTwentyFourteenAndTwentySeventeenMember
   
Conversion price on call spread transaction   $ 57.46nem_ConversionPriceOnCallSpreadTransaction
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotesNetOfDiscountTwentyFourteenAndTwentySeventeenMember
   
2012 Convertible Senior Notes [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Common stock, shares issued       0us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= nem_ConvertibleSeniorNotes2012Member
Equity Option [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares 2,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
3,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
3,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
 
Other Equity Option [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares     2,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= nem_OtherStockOptionMember