Acquisitions and Other Transactions Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	[1]	Sep. 30, 2020	Sep. 30, 2019	[1]	Dec. 31, 2019	[1]	Dec. 05, 2019
Asset Impairment Charges	$ 1,474	$ 12		$ 2,803	$ 62
Revenues	9,955	13,495		28,920	40,493
Advances to and investments in unconsolidated affiliates	3,063			3,063			$ 3,454
Net Income (Loss) Attributable to Parent	$ (657)	$ 977		$ (896)	$ 2,930
SemGroup [Member]
Debt Securities, Noncurrent									$ 1,375
SemGroup Subsidiary [Member]
Debt Securities, Noncurrent									$ 593

[1] *As adjusted. See Note 1.