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Partners' Capital and Distributions - Preferred Unit Issuance (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jan. 28, 2016
USD ($)
item
$ / shares
shares
Dec. 31, 2016
USD ($)
Partners Capital and Distributions    
Net proceeds from private placement | $   $ 1,542
Series A Convertible Preferred Units    
Partners Capital and Distributions    
Private placement of units (in units) | shares 61.0  
Cash purchase price (in dollars per unit) $ 26.25  
Transaction fee due to purchasers 2.00%  
Net proceeds from private placement | $ $ 1,600  
Quarterly distributions per unit (in dollars per unit) $ 0.525  
Annualized distribution rate (in dollars per unit) $ 2.10  
Preferred unit conversion ratio 1  
Common unit closing price as a percentage of Issue Price, over which the entity has conversion option 150.00%  
Period for closing price of common units to be above threshold, to trigger conversion option 20 days  
Period after fifth and subsequent anniversaries of issuance for Distribution Rate Resets 30 days  
Number of distribution rate reset elections allowed | item 1  
Period after sixth anniversary of issuance, after which units may be redeemed if distribution rate has been reset 30 days  
Value of common units if exchanged for redemption of preferred units, as a percentage of average price 95.00%  
Redemption price as a percentage of Issue Price 110.00%  
US Treasury Rate | Series A Convertible Preferred Units    
Partners Capital and Distributions    
Basis spread on variable rate 5.85%