Goodwill and Intangibles (Reconciliation of Goodwill) (Details) - USD ($) $ in Millions				12 Months Ended
		Nov. 30, 2019	Nov. 29, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Gross goodwill				$ 10,863		$ 2,375
Accumulated impairment losses				(1,327)		(130)
Goodwill, beginning balance				10,016	$ 2,245
Impairment losses		$ (41)	$ (1,156)	(1,197)
Acquisitions	[1]			717	7,771
Goodwill, ending balance				9,536	10,016
Logistics and Storage [Member]
Goodwill [Line Items]
Gross goodwill				7,722		162
Accumulated impairment losses				0		0
Goodwill, beginning balance				7,234	162
Impairment losses				0
Acquisitions	[1]			488	7,072
Goodwill, ending balance				7,722	7,234
Gathering and Processing [Member]
Goodwill [Line Items]
Gross goodwill				3,141		2,213
Accumulated impairment losses				(1,327)		$ (130)
Goodwill, beginning balance				2,782	2,083
Impairment losses				1,197
Acquisitions	[1]			229	699
Goodwill, ending balance				$ 1,814	$ 2,782

[1] Acquisitions in 2018 are inclusive of the Mt. Airy Terminal acquisition as well as the Merger while acquisitions in 2019 are inclusive of measurement period adjustments related to the previously mentioned transactions.