Commitments and Contingencies - Legal, Environmental or Regulatory (Details)		1 Months Ended	12 Months Ended	80 Months Ended
	Oct. 14, 2020 USD ($)	May 31, 2015 bbl	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) lawsuit	Dec. 31, 2020 USD ($)	Apr. 25, 2019 USD ($)	Sep. 07, 2018 count
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities			$ 57,000,000	$ 57,000,000	$ 55,000,000
Estimated undiscounted reserve for environmental liabilities, short-term			11,000,000	11,000,000	8,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements			11,000,000	11,000,000	6,000,000
Other long-term liabilities and deferred credits
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities, long-term			46,000,000	46,000,000	$ 47,000,000
Other long-term assets, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements			1,000,000	1,000,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities			103,000,000	103,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements			105,000,000	105,000,000
Estimated size of release (in bbl) | bbl		2,934
Estimated size of release to reach Pacific Ocean (in bbl) | bbl		598
Aggregate total estimated costs			495,000,000	495,000,000
Recoveries from insurance carriers				250,000,000
Total release costs probable of recovery			355,000,000	$ 355,000,000
Line 901 Incident | Civil Penalties
Legal, Environmental or Regulatory Matters
Penalties or compensation paid	$ 24,000,000
Line 901 Incident | Compensation for Injuries to, Destruction of, Loss of Use of, Natural Resources
Legal, Environmental or Regulatory Matters
Penalties or compensation paid	$ 22,325,000
Line 901 Incident | May 2016 Indictment
Legal, Environmental or Regulatory Matters
Number of felony charges found guilty | count							1
Number of misdemeanor charges found guilty | count							8
Number of misdemeanor charges found guilty, reporting | count							1
Number of misdemeanor charges found guilty, strict liability discharge | count							1
Number of misdemeanor charges found guilty, strict liability animal takings | count							6
Number of misdemeanor charges not guilty, strict liability animal takings | count							1
Fines or penalties assessed						$ 3,350,000
Line 901 Incident | May 2016 Indictment | Maximum
Legal, Environmental or Regulatory Matters
Amount awarded to claimants by Court			$ 150,000
Line 901 Incident | Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit				9
Line 901 Incident | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit				4