Reportable Segments Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	[1]	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Inventory valuation adjustments	$ 11		$ (26)			$ (126)	$ 71
Segment Adjusted EBITDA	2,868		2,814			7,947	8,375	[1]
Depreciation, depletion and amortization	(910)		(782)			(2,709)	(2,334)
Interest expense, net of interest capitalized	(569)		(575)			(1,747)	(1,680)	[1]
Asset Impairment Charges	(1,474)		(12)			(2,803)	(62)	[1]
Gains (losses) on interest rate derivatives	55		(175)			(277)	(371)	[1]
Non-cash compensation expense	(29)		(27)			(92)	(85)	[1]
Unrealized gains (losses) on commodity risk management activities	(30)		64			(27)	90
Gain (Loss) on Extinguishment of Debt	0		0			(59)	(2)	[1]
Adjusted EBITDA related to unconsolidated affiliates	(169)		(161)			(480)	(470)
Equity in earnings (losses) of unconsolidated affiliates	(32)		82			46	224	[1]
Other, net	88		103			68	211
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT)	(320)	$ 5,312	1,305		$ 4,099	(388)	3,967	[1]
Income tax expense (benefit)	(42)		(55)			(169)	(216)	[1]
Net income (loss)	(362)	$ 5,112	1,250		$ 3,829	(557)	3,751	[1]
Equity Method Investment, Other than Temporary Impairment	129		0			129	0	[1]
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	203		235			630	777	[1]
Interstate transportation and storage
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	425		442			1,232	1,358	[1]
Midstream
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	530		411			1,280	1,205	[1]
NGL and refined products transportation and services
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	762		667			2,099	1,923	[1]
Crude oil transportation and services
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	631		726			1,741	2,222	[1]
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	189		192			580	497	[1]
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	104		104			315	310	[1]
All other
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ 24		$ 37			$ 70	$ 83	[1]

[1] *As adjusted. See Note 1.