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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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