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Reportable Segments Table - Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ 2,635	$ 2,735
Depreciation, depletion and amortization	(867)	(774)
Interest expense, net	(602)	(590)
Impairment losses	(1,325)	(50)
Losses on interest rate derivatives	(329)	(74)
Non-cash compensation expense	(22)	(29)
Unrealized gains (losses) on commodity risk management activities	51	49
Losses on extinguishments of debt	(62)	(18)
Inventory valuation adjustments	(227)	93
Equity in earnings (losses) of unconsolidated affiliates	(7)	65
Adjusted EBITDA related to unconsolidated affiliates	(154)	(146)
Other, net	27	17
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE	(936)	1,244	$ 5,020	$ 3,689
Income tax (benefit) expense from continuing operations	(28)	(126)
Net income (loss)	(964)	1,118	$ 4,825	$ 3,420
Intrastate Transportation And Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	240	252
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	209	153
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	106	101
Adjustments And Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	39	35
Interstate Transportation and Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	404	456
Midstream [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	383	382
NGL and refined products transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	663	612
Crude oil transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ 591	$ 744