Acquisitions and Investments (Acquisition of Refinery and Related Logistics and Marketing Assets) (Detail) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 01, 2013 Galveston Bay Refinery And Related Assets [Member] site Terminal Pipeline BPCD MW BPD	Dec. 31, 2013 Galveston Bay Refinery And Related Assets [Member]	Dec. 31, 2013 Galveston Bay Refinery And Related Assets [Member] Prepaid Licensed Refinery Technology Agreements [Member]	Dec. 31, 2013 Galveston Bay Refinery And Related Assets [Member] Customer Relationships [Member]
Business Acquisition [Line Items]
Refinery capacity (in barrels per calendar day)				451,000
Intrastate natural gas liquid pipelines (in number of pipelines)				3
Number of light product terminals (in number of terminals)				4
Number of branded sites (in number of sites)				1,200
Electric cogeneration capacity, megawatts				1,040
Allocation of space on Colonial Pipeline (in barrels per day)				50,000
Cash paid for acquisition	$ 1,515,000,000	$ 190,000,000	$ 74,000,000		$ 1,491,000,000
Inventories					935,000,000
Maximum earnout provision payable to the company					700,000,000
Term of payment of maximum earnout provision payable to the company, years				6 years
Maximum earnout payment, year one					200,000,000
Maximum earnout payment, year two					200,000,000
Maximum earnout payment, year three					200,000,000
Maximum earnout payment, year four					250,000,000
Maximum earnout payment, year five					250,000,000
Maximum earnout payment, year six					250,000,000
Contingent liability				600,000,000	625,000,000
Contingent liability, current					159,000,000
Post-closing adjustment					9,000,000
Finite-lived intangibles						68,000,000	20,000,000
Intangible asset, useful life						15 years	4 years
Weighted average useful life					13 years
Acquisition related costs					$ 7,000,000