Commitments and Contingencies (Details)			3 Months Ended	0 Months Ended		1 Months Ended	26 Months Ended	2 Months Ended	23 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Minimum	Jan. 15, 2015 PMC National Energy Board Audit item	Feb. 28, 2015 PMC National Energy Board Audit CAD	Feb. 28, 2013 Bay Springs Pipeline Release bbl	Mar. 31, 2015 Bay Springs Pipeline Release USD ($)	Jun. 30, 2013 Kemp River Pipeline Release bbl item	Mar. 31, 2015 Kemp River Pipeline Release USD ($)	Mar. 31, 2015 Kemp River Pipeline Release PMC USD ($)	Apr. 30, 2015 In the Matter of Bakersfield Crude Terminal LLC et al Subsequent Event USD ($) item
Environmental
Estimated undiscounted reserve for environmental liabilities	$ 75,000,000	$ 82,000,000
Estimated undiscounted reserve for environmental liabilities, short-term	11,000,000	13,000,000
Estimated undiscounted reserve for environmental liabilities, long-term	64,000,000	69,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements	7,000,000	8,000,000
Actual cash expenditures for environmental liabilities, period paid			3 years
Number of events occurred								2
Estimated size of release (in barrels)						120		700
Number of conditions imposed related to regulatory compliance				6
Number of alleged rule violations											10
Charges, fines or penalties assessed					76,000					0	0
Total estimated cost to clean up and remediate the site									15,000,000
Total cost to clean up and remediate the site							6,000,000
Cost incurred, to date, to clean up and remediate the site									$ 9,000,000