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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
count
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2017
USD ($)
Nov. 15, 2022
$ / shares
Partners Capital and Distribution [Line Items]          
Partners' capital account, public sale of units | $       $ 788  
Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Shares issued, price per share   $ 26.25      
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 Distribution [Line Items]          
Sale of units, price per unit (in dollars per unit) $ 1,000        
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%    
Sale of Series B preferred units (in units) | shares 800,000        
Partners' capital account, public sale of units | $ $ 788        
Series B Preferred Units | Forecast          
Partners Capital and Distribution [Line Items]          
Percentage spread on top of LIBOR for distribution         4.11%
Redemption price (in dollars per unit)         $ 1,000