XML 26 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
Partners' Capital and Distributions (Details 4) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended
Feb. 29, 2012
Mar. 31, 2012
Bcf
PNG
    
Performance Thresholds    
General partner ownership interest (as a percent)   2.00%
Series B Subordinated Units
    
Performance Thresholds    
Number of distinct tranches   5
Series B Subordinated Units | Tranche 1 | PNG
    
Performance Thresholds    
Previous annualized distribution benchmark $ 1.44  
Annualized distribution level (in dollars per unit)   $ 1.71
Working gas storage capacity (in Bcf)   29.6
Series B subordinated units that will convert into Series A subordinated units   2.6
Series B Subordinated Units | Tranche 2 | PNG
    
Performance Thresholds    
Previous annualized distribution benchmark $ 1.53  
Annualized distribution level (in dollars per unit)   $ 1.71
Working gas storage capacity (in Bcf)   35.6
Series B subordinated units that will convert into Series A subordinated units   2.8
Series B Subordinated Units | Tranche 3 | PNG
    
Performance Thresholds    
Previous annualized distribution benchmark $ 1.63  
Annualized distribution level (in dollars per unit)   $ 1.71
Working gas storage capacity (in Bcf)   41.6
Series B subordinated units that will convert into Series A subordinated units   2.1
Series B Subordinated Units | Tranche 4 | PNG
    
Performance Thresholds    
Annualized distribution level (in dollars per unit)   $ 1.71
Working gas storage capacity (in Bcf)   48.0
Series B subordinated units that will convert into Series A subordinated units   3.0
Series B Subordinated Units | Tranche 5 | PNG
    
Performance Thresholds    
Annualized distribution level (in dollars per unit)   $ 1.80
Working gas storage capacity (in Bcf)   48.0
Series B subordinated units that will convert into Series A subordinated units   3.0