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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 at Dec. 31, 2009 $ 4,159 $ 3,965 $ 131 $ 4,096 $ 63
Balance (in units) at Dec. 31, 2009   272,300,000      
Increase (Decrease) in Partners' Capital          
Net income 514 330 175 505 9
Sale of noncontrolling interest in a subsidiary (Note 10) 268 99 2 101 167
Distributions (692) (512) (170) (682) (10)
Issuance of common units 296 290 6 296  
Issuance of common units (in units) 9,600,000 9,600,000      
Issuance of common units under LTIP 16 16   16  
Issuance of common units under LTIP (in units)   500,000      
Equity compensation expense (Note 15) 16 4 9 13 3
Other comprehensive income/(loss) (5) (5)   (5)  
Other 1 2   2 (1)
Balance at Dec. 31, 2010 4,573 4,189 153 4,342 231
Balance (in units) at Dec. 31, 2010   282,400,000      
Increase (Decrease) in Partners' Capital          
Net income 994 730 236 966 28
Sale of noncontrolling interest in a subsidiary (Note 10) 370 63 1 64 306
Distributions (831) (575) (216) (791) (40)
Issuance of common units 889 870 19 889  
Issuance of common units (in units) 27,900,000 27,900,000      
Issuance of common units under LTIP 15 15   15  
Issuance of common units under LTIP (in units)   500,000      
Equity compensation expense (Note 15) 28 16 9 25 3
Other comprehensive income/(loss) (64) (59) (1) (60) (4)
Balance at Dec. 31, 2011 5,974 5,249 201 5,450 524
Balance (in units) at Dec. 31, 2011 310,753,874 310,800,000      
Increase (Decrease) in Partners' Capital          
Net income 1,127 789 305 1,094 33
Distributions (1,017) (684) (285) (969) (48)
Issuance of common units 979 959 20 979  
Issuance of common units (in units) 23,500,000 23,500,000      
Issuance of common units under LTIP 34 33 1 34  
Issuance of common units under LTIP (in units)   1,000,000      
Equity compensation expense (Note 15) 28 18 6 24 4
Distribution equivalent right payments (Note 15) (5) (4)   (4) (1)
Other comprehensive income/(loss) 26 28 1 29 (3)
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