XML 43 R19.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
AccountingPoliciesAbstract  
Depreciation Rates
 Category of Property     
       
 Gathering facilities 0.18%-1.66% 
 Storage facilities 2.10%-3.70% 
 Onshore transmission facilities 2.79%-5.71% 
 Offshore transmission facilities 1.01%-1.01%