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Derivatives and Concentration of Credit Risk - Concentration of Credit Risk (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Concentration Risk [Line Items]
Accounts Receivable, Net	$ 450	$ 405
Income Taxes Receivable	19	38
Maximum Potential Future Exposure On Credit Risk Derivatives Gross	67
Maximum Potential Future Exposure On Credit Risk Derivatives Net	$ 22
Number of largest net counter party positions investment grade	5
Percentage of net credit exposure from derivatives	98.00%
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 40
Other Products And Services [Member]
Concentration Risk [Line Items]
Accounts Receivable, Net	336	269
Other Ownership Interest [Member]
Concentration Risk [Line Items]
Accounts Receivable, Net	88	98
Other Receivables [Member]
Concentration Risk [Line Items]
Accounts Receivable, Net	$ 7	$ 0
United Energy Trading [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	20.00%	23.00%
Occidental [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	18.00%	16.00%
Crestwood [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			21.00%
St. Paul Refining [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			16.00%
Delek Refining [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			10.00%
BP Products North America, Inc [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.00%
NGL Energy Partners [Member] \| NGL Crude Logistics [Member] \| Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	13.00%	14.00%	13.00%
NGL Energy Partners [Member] \| Minimum \| Operating Expense [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	2.00%