Reportable Segments 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]
Inventory valuation adjustments	$ (227)	$ 93
Segment Adjusted EBITDA	2,615	2,733
Depreciation, depletion and amortization	(851)	(771)
Interest expense, net of interest capitalized	(595)	(527)	[1]
Asset Impairment Charges	(1,325)	(50)	[1]
Losses on interest rate derivatives	(329)	(74)	[1]
Non-cash compensation expense	(18)	(29)	[1]
Unrealized gains on commodity risk management activities	51	49
Gain (Loss) on Extinguishment of Debt	(59)	(2)	[1]
Adjusted EBITDA related to unconsolidated affiliates	(154)	(146)
Equity in earnings (losses) of unconsolidated affiliates	(7)	65	[1]
Other, net	45	4
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT)	(854)	1,345		$ 5,312	$ 4,099
Income tax expense (benefit)	(53)	(126)	[1]
Net income (loss)	(907)	1,219	[1]	$ 5,112	$ 3,829
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	240	252
Interstate transportation and storage
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	404	456
Midstream
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	383	382
NGL and refined products transportation and services
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	663	612
Crude oil transportation and services
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	591	744
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
All other
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ 19	$ 33

[1] *As adjusted. See Note 1.