Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended	1 Months Ended	20 Months Ended	2 Months Ended	17 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Minimum	Feb. 28, 2013 Bay Springs Pipeline Release bbl	Sep. 30, 2014 Bay Springs Pipeline Release	Jun. 30, 2013 Kemp River Pipeline Release event bbl	Sep. 30, 2014 Kemp River Pipeline Release
Environmental
Estimated undiscounted reserve for environmental liabilities	$ 87	$ 93
Estimated undiscounted reserve for environmental liabilities, short-term	13	11
Estimated undiscounted reserve for environmental liabilities, long-term	74	82
Probable recoveries from insurers and from third parties under indemnification agreements	9	10
Actual cash expenditures for environmental liabilities, period paid			3 years
Number of events occurred						2
Estimated size of release (in barrels)				120		700
Total estimated cost to clean up and remediate the site, before insurance recoveries							15
Total cost to clean up and remediate the site, before insurance recoveries					6
Cost incurred, to date, to clean up and remediate the site, before insurance recoveries							8
Charges, fines or penalties assessed							$ 0