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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

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