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Partners' Capital and Distributions (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes in the noncontrolling interests in partners' capital    
Beginning balance $ 509  
Net income attributable to noncontrolling interests 536 237
Equity compensation expense 8  
Other 1  
Other comprehensive income/(loss):    
Reclassification adjustments (5)  
Net deferred gain/(loss) on cash flow hedges 27  
Ending Balance 504  
Noncontrolling Interests
    
Changes in the noncontrolling interests in partners' capital    
Beginning balance 509 524
Net income attributable to noncontrolling interests 8 7
Distribution to noncontrolling interest (12) (12)
Equity compensation expense 1 1
Other 1  
Other comprehensive income/(loss):    
Reclassification adjustments 2 (6)
Net deferred gain/(loss) on cash flow hedges (5) 2
Ending Balance $ 504 $ 516