v2.4.0.6
Document And Entity Information
3 Months Ended
Mar. 31, 2013
Document Information [Abstract]  
Document Type 10-Q
Amendment Flag false
Entity Registrant Name Southern Union Co
Entity Central Index Key 0000203248
Document Period End Date Mar. 31, 2013
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2013
Document Fiscal Period Focus Q1
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 0