Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Document And Entity Information [Abstract]    
Entity Registrant Name NOBLE ENERGY INC  
Entity Central Index Key 0000072207  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Public Float   $ 28.0
Entity Common Stock, Shares Outstanding 387,004,520  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2015