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Redeemable Preferred Units (Rollforward of Redeemable Preferred Units) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 13, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]        
Redeemable preferred units, beginning balance   $ 1,000    
Issuance of redeemable preferred units   0 $ 0 $ 984
Distributions to unitholders and general partner   (1,819) (1,120) (845)
Redeemable preferred units, ending balance   1,004 1,000  
Series A Convertible Preferred Units        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable preferred units, beginning balance   1,000 1,000  
Issuance of redeemable preferred units $ 984      
Net income allocated   75 65  
Distributions to unitholders and general partner   (71) (65)  
Redeemable preferred units, ending balance   $ 1,004 $ 1,000 $ 1,000