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Consolidated Statement of Equity - 3 months ended Mar. 31, 2017 - USD ($)
$ in Millions
Total
Common Units - Public [Member]
Common Units - Affiliated [Member]
Series A Preferred Units [Member]
Partners' Capital Account, Public Sale of Units Net of Offering Costs $ 33 $ (33) $ 0  
Equity Issued To Partners Capital Account 300     $ 300
Beginning balance at Dec. 31, 2016 2,196 1,467 729 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Equity issued under ATM issuance, net   45    
Cash distribution (104)   (59)  
Unit-based compensation 4 2 2  
Other (1) 0 (1)  
Partnership net income 1 1 0  
Ending balance at Mar. 31, 2017 $ 2,429 $ 1,458 $ 671 $ 300