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Equity Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
AAP LP Class B Units
Mar. 31, 2013
AAP LP Class B Units
Maximum
Feb. 28, 2013
Class B Units of PNGS GP LLC
Jul. 31, 2010
Class B Units of PNGS GP LLC
Dec. 31, 2012
Class B Units of PNGS GP LLC
Share-based Compensation Arrangement, by Share-based Payment Award              
Equity compensation expense $ 51 $ 39   $ 1      
Authorized grants (in units)           165,000  
Units outstanding (in units)             74,250
Units canceled (in units)         74,250    
Annualized distribution, low end of range (in dollars per unit)           $ 2.00  
Annualized distribution, high end of range (in dollars per unit)           $ 2.70  
Reserved for Future Grants              
Reserved for future grants outstanding, beginning balance (in units)     17,875        
Unit granted (in units)     (3,500)        
Reserved for future grants outstanding, ending balance (in units)     14,375        
Outstanding              
Outstanding at the beginning of the period (in units)     182,125        
Unit granted (in units)     3,500        
Outstanding at the ending of the period (in units)     185,625        
Outstanding Units Earned              
Outstanding Units Earned, beginning balance (in units)     130,250        
Units earned (in units)     26,000        
Outstanding Units Earned, end balance (in units)     156,250        
Grant Date Fair Value of Outstanding Class B Units:              
Grant Date Fair Value of Outstanding Class B Units, beginning balance     44        
Unit granted     6        
Grant Date Fair Value of Outstanding Class B Units, ending balance     $ 50