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Partners' Capital and Distributions - Preferred Unit Issuance (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 10, 2017
USD ($)
$ / shares
shares
Jan. 28, 2016
USD ($)
count
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 15, 2022
$ / shares
Partners Capital and Distributions          
Net proceeds from sale of Series A preferred units | $       $ 1,542  
Net proceeds from the sale of Series B preferred units | $     $ 788    
Series A Preferred Units          
Partners Capital and Distributions          
Sale of Series A preferred units (in units) | shares   61,000,000      
Sale of units, price per unit (in dollars per unit)   $ 26.25      
Transaction fee due to purchasers   2.00%      
Net proceeds from sale of Series A preferred units | $   $ 1,600      
Quarterly distributions per unit (in dollars per unit)   $ 0.525      
Annualized distribution rate (in dollars per unit)   $ 2.10      
Series A 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 | count   1      
Distribution rate reset, basis spread on variable rate   5.85%      
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%      
Series B Preferred Units          
Partners Capital and Distributions          
Sale of units, price per unit (in dollars per unit) $ 1,000        
Sale of Series B preferred units (in units) | shares 800,000        
Net proceeds from the sale of Series B preferred units | $ $ 788        
Liquidation preference (in dollars per unit) $ 1,000        
Distribution rate percentage 6.125%        
Distribution rate per unit $ 61.25        
Redemption price (in dollars per unit) $ 1,020        
Redemption price percentage 102.00%        
Series B Preferred Units | Forecast          
Partners Capital and Distributions          
Percentage spread on top of LIBOR for distribution         4.11%
Redemption price (in dollars per unit)         $ 1,000