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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 536 433 95 528 8
Distributions (286) (189) (85) (274) (12)
Issuance of common units 131.0 128.0 3.0 131.0  
Issuance of common units (in units)   2,400,000      
Equity compensation expense 8 7   7 1
Distribution equivalent right payments (1) (1)   (1)  
Other comprehensive loss (46) (42) (1) (43) (3)
Other 1       1
Balance at Mar. 31, 2013 $ 7,489 $ 6,724 $ 261 $ 6,985 $ 504
Balance (in units) at Mar. 31, 2013 337,739,553 337,700,000