Acquisitions and Other Transactions Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	[1]	Jun. 30, 2020	Jun. 30, 2019	[1]	Dec. 31, 2019	[1]	Dec. 05, 2019
Asset Impairment Charges	$ 4	$ 0		$ 1,329	$ 50
Revenues	7,338	13,877		18,965	26,998
Advances to and investments in unconsolidated affiliates	3,306			3,306			$ 3,454
Net Income (Loss) Attributable to Parent	$ 481	$ 1,003		$ (239)	$ 1,953
SemGroup [Member]
Debt Securities, Noncurrent									$ 1,375
SemGroup Subsidiary [Member]
Debt Securities, Noncurrent									$ 593

[1] *As adjusted. See Note 1.