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Net Income per Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 21, 2017
Aug. 15, 2016
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share Basic [Line Items]        
Net income and comprehensive income     $ 1 $ 62
Net income and comprehensive income     1 62
Incentive distribution rights $ 21 $ 21 21 20
Distributions on nonvested phantom unit awards     2 1
Limited partners' interest in net income       41
Common Units [Member]        
Earnings Per Share Basic [Line Items]        
Limited partners' interest in net income     $ (22) $ 38
Weighted average limited partner units outstanding:        
Common - basic (in shares)     98,609,608 87,453,333
Common - equivalents (in shares)     106,350 21,354
Common - diluted (in shares)     98,715,958 87,474,687
Net income per limited partner unit (basic and diluted) (in dollars per share)     $ (0.22) $ 0.47