Consolidated Statements of Cash Flows Parenthetical	Sep. 30, 2018	Mar. 14, 2018
Tamar and Dalit Fields \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Percentage ownership sold	7.50%	7.50%

Disposal Group, Not Discontinued Operation, Percentage Sold

No definition available.

Name:	nbl_DisposalGroupNotDiscontinuedOperationPercentageSold
Namespace Prefix:	nbl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant