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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Units
General Partner
Partners' Capital Excluding Noncontrolling Interests
Noncontrolling Interests
Balance, beginning of period at Dec. 31, 2012 $ 7,146 $ 6,388 $ 249 $ 6,637 $ 509
Balance, beginning of period (in units) at Dec. 31, 2012   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, net of units tendered by employees to satisfy tax withholding obligations (11) (11)   (11)  
Issuance of common units under LTIP, net of units tendered by employees to satisfy tax withholding obligations (in units)   500,000      
Equity-indexed compensation expense 20 16 2 18 2
Distribution equivalent right payments (3) (3)   (3)  
Other comprehensive income/(loss) (138) (139) (3) (142) 4
Issuance of PNG common units 30 6   6 24
Balance, end of period at Jun. 30, 2013 7,629 6,828 270 7,098 531
Balance, end of period (in units) at Jun. 30, 2013   341,700,000      
Balance, beginning of period at Dec. 31, 2013 7,703 7,349 295 7,644 59
Balance, beginning of period (in units) at Dec. 31, 2013 359,133,200 359,100,000      
Increase (Decrease) in Partners' Capital          
Net income 672 435 236 671 1
Distributions (673) (450) (222) (672) (1)
Issuance of common units 453 444 9 453  
Issuance of common units (in units)   8,100,000      
Issuance of common units under LTIP, net of units tendered by employees to satisfy tax withholding obligations (17) (18) 1 (17)  
Issuance of common units under LTIP, net of units tendered by employees to satisfy tax withholding obligations (in units)   600,000      
Equity-indexed compensation expense 23 19 4 23  
Distribution equivalent right payments (3) (3)   (3)  
Other comprehensive income/(loss) (45) (44) (1) (45)  
Other (1) (1)   (1)  
Balance, end of period at Jun. 30, 2014 $ 8,112 $ 7,731 $ 322 $ 8,053 $ 59
Balance, end of period (in units) at Jun. 30, 2014 367,822,748 367,800,000