Condensed Consolidated Financial Statements - Additional Information (Detail) (NUSA [Member])	Sep. 30, 2014
NUSA [Member]
Percent ownership of Newmont USA by Newmont Mining Corporation	100.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant