Net Income or Loss per Limited Partner Unit Additional Detail (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted Average Number Diluted Shares Outstanding Adjustment	208,655,498	143,317,328	208,329,928	143,317,328
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$ 0.15	$ 0.43	$ (2.55)	$ 0.57
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	$ 0.15	$ 0.43	$ (2.55)	$ 0.57
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	325,570	0	0	0
Weighted Average Number of Shares Outstanding, Basic	208,329,928	143,317,328	208,329,928	143,317,328
Net Income (Loss) Allocated to Limited Partners	$ 32	$ 62	$ (532)	$ 82
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	325,570