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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic Net Income per Common Unit    
Net income $ 288 $ 444
Distributions to participating securities (1) (1)
Other (1) (3)
Net income allocated to common unitholders 237 406
Diluted Net Income per Common Unit    
Net income 288 444
Distributions to participating securities (1) (1)
Other (1)  
Net income allocated to common unitholders $ 237 $ 443
Effect of dilutive securities:    
Series A preferred units (units)   65
Equity-indexed compensation plan awards (units) 2 2
Series A Preferred Units    
Basic Net Income per Common Unit    
Distributions to preferred unitholders $ (37) $ (34)
Diluted Net Income per Common Unit    
Distributions to preferred unitholders (37)  
Series B Preferred Units    
Basic Net Income per Common Unit    
Distributions to preferred unitholders (12)  
Diluted Net Income per Common Unit    
Distributions to preferred unitholders $ (12)  
Common Units    
Basic Net Income per Common Unit    
Basic weighted average common units outstanding (units) 725 691
Basic net income per common unit (usd per unit) $ 0.33 $ 0.59
Diluted Net Income per Common Unit    
Basic weighted average common units outstanding (units) 725 691
Effect of dilutive securities:    
Diluted weighted average common units outstanding (units) 727 758
Diluted net income per common unit (usd per unit) $ 0.33 $ 0.58