Goodwill and Intangibles Goodwill (Details)		3 Months Ended	12 Months Ended
	Nov. 30, 2019	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill, Gross		$ 10,863,000,000		$ 10,146,000,000
Goodwill, Impaired, Accumulated Impairment Loss		(3,141,000,000)		(130,000,000)
Goodwill		7,722,000,000	$ 9,536,000,000	10,016,000,000
Goodwill, Impairment Loss		$ (1,814,000,000)	(1,197,000,000)
Goodwill, Acquired During Period			717,000,000
Total Number of Reporting Units		6
Reporting Unit, Zero or Negative Carrying Amount, Amount of Allocated Goodwill			1
Number of Reporting Units	6	4
Crude Gathering [Member]
Goodwill [Line Items]
Goodwill		$ 1,100,000,000
Minimum [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		8.50%
Maximum [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		270.00%
L&S
Goodwill [Line Items]
Goodwill, Gross		$ 7,722,000,000		7,234,000,000
Goodwill, Impaired, Accumulated Impairment Loss		0		0
Goodwill		7,722,000,000	7,722,000,000	7,234,000,000
Goodwill, Impairment Loss		0	0
Goodwill, Acquired During Period			488,000,000
G&P
Goodwill [Line Items]
Goodwill, Gross		3,141,000,000		2,912,000,000
Goodwill, Impaired, Accumulated Impairment Loss		(3,141,000,000)		(130,000,000)
Goodwill		0	1,814,000,000	$ 2,782,000,000
Goodwill, Impairment Loss		$ (1,814,000,000)	(1,197,000,000)
Goodwill, Acquired During Period			$ 229,000,000
Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member] | Goodwill [Member] | Minimum [Member]
Goodwill [Line Items]
Fair Value Inputs		9.50%
Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member] | Goodwill [Member] | Maximum [Member]
Goodwill [Line Items]
Fair Value Inputs		11.50%