v3.6.0.2
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Jan. 31, 2017
Jun. 30, 2016
Document And Entity Information [Abstract]      
Entity Registrant Name NORFOLK SOUTHERN CORP    
Entity Central Index Key 0000702165    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   290,553,713  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 24,959,609,647