Net Income or Loss per Limited Partner Unit Additional Detail (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Weighted Average Number Diluted Shares Outstanding Adjustment	208,662,096	143,322,121	208,334,185	143,318,943
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$ 0.46	$ (1.59)	$ (2.09)	$ (1.02)
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	$ 0.46	$ (1.59)	$ (2.09)	$ (1.02)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	319,350	0	0	0
Weighted Average Number of Shares Outstanding, Basic	208,342,746	143,322,121	208,334,185	143,318,943
Net Income (Loss) Allocated to Limited Partners	$ 96	$ (228)	$ (436)	$ (146)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			319,350