Reportable Segments Table - 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]
Segment Adjusted EBITDA	$ 2,866		$ 2,812			$ 7,939	$ 8,372	[1]
Depreciation, depletion and amortization	(912)		(784)			(2,715)	(2,343)	[1]
Interest expense, net	(569)		(579)			(1,750)	(1,747)	[1]
Impairment losses	(1,474)		(12)			(2,803)	(62)	[1]
Gains (losses) on interest rate derivatives	55		(175)			(277)	(371)	[1]
Non-cash compensation expense	(30)		(27)			(93)	(85)	[1]
Unrealized gains (losses) on commodity risk management activities	(30)		64			(27)	90
Losses on extinguishments of debt	0		0			(62)	(18)	[1]
Inventory valuation adjustments	11		(26)			(126)	71	[1]
Equity in earnings (losses) of unconsolidated affiliates	(32)		82			46	224	[1]
Adjusted EBITDA related to unconsolidated affiliates	(169)		(161)			(480)	(470)
Other, net	(53)		(47)			48	(67)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE	(360)	$ 5,020	1,241		$ 3,689	(525)	3,728	[1]
Income tax (benefit) expense from continuing operations	(41)		(54)			(168)	(214)	[1]
Net income (loss)	(401)	$ 4,825	1,187		$ 3,420	(693)	3,514	[1]
Equity Method Investment, Other than Temporary Impairment	(129)		0			(129)	0	[1]
Intrastate Transportation And Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	203		235			630	777	[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]
Adjustments And Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	22		35			62	80	[1]
Interstate Transportation and Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	425		442			1,232	1,358	[1]
Midstream [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	530		411			1,280	1,205	[1]
NGL and refined products transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	762		667			2,099	1,923	[1]
Crude oil transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ 631		$ 726			$ 1,741	$ 2,222	[1]

[1] *As adjusted. See Note 1.