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CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Units
General Partner
Partners' Capital Excluding Noncontrolling Interests
Noncontrolling Interests
Balance at Dec. 31, 2012 $ 7,146 $ 6,388 $ 249 $ 6,637 $ 509
Balance (in units) at Dec. 31, 2012 335,283,874 335,300,000      
Increase (Decrease) in Partners' Capital          
Net income 837 631 190 821 16
Distributions (583) (384) (175) (559) (24)
Issuance of common units 331 324 7 331  
Issuance of common units (in units)   5,900,000      
Issuance of common units under LTIP 4 4   4  
Issuance of common units under LTIP (in units)   800,000      
Units tendered by employees to satisfy tax withholding obligations (15) (15)   (15)  
Units tendered by employees to satisfy tax withholding obligations (in units)   (300,000)      
Equity-indexed compensation expense 20 16 2 18 2
Distribution equivalent right payments (3) (3)   (3)  
Other comprehensive loss (138) (139) (3) (142) 4
Issuance of PNG common units 30 6   6 24
Balance at Jun. 30, 2013 7,629 6,828 270 7,098 531
Balance (in units) at Jun. 30, 2013 341,691,037 341,700,000      
Balance at Mar. 31, 2013          
Increase (Decrease) in Partners' Capital          
Net income 300        
Other comprehensive loss (92)        
Issuance of PNG common units       6  
Balance at Jun. 30, 2013 $ 7,629     $ 7,098  
Balance (in units) at Jun. 30, 2013 341,691,037