Commitments and Contingencies (Detail) (USD $)	6 Months Ended		6 Months Ended			6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Hess Retail	Jun. 30, 2014 Galveston Bay Refinery and Related Assets	Feb. 01, 2013 Galveston Bay Refinery and Related Assets	Jun. 30, 2014 North Dakota Pipeline	Jun. 30, 2014 Indemnification Agreement Marathon Oil Companies	Jun. 30, 2014 Other Guarantees Equity method investees	Jun. 30, 2014 Guarantee of Indebtedness of Others Financial Guarantee LOOP and LOCAP LLC	Jun. 30, 2014 Master Shelf Agreement Financial Guarantee Centennial	Jun. 30, 2014 Standby Letters of Credit Financial Guarantee TAME	Jun. 30, 2014 Pending Litigation	Jun. 30, 2014 Pending Litigation Emergency Pricing And Consumer Protection Laws
Loss Contingencies [Line Items]
Loss contingency, inestimable loss												For matters for which we have not recorded an accrued liability, we are unable to estimate a range of possible loss because the issues involved have not been fully developed through pleadings and discovery.
Accrued liabilities for remediation	$ 137,000,000	$ 123,000,000
Receivables for recoverable costs	51,000,000	51,000,000
Alleged amount overcharged from customers													89,000,000
Loss contingency, period of occurrence													during September and October 2005
Plaintiff													Commonwealth of Kentucky
Line of credit facility, expiration date									Dec. 31, 2037	Dec. 31, 2024	Dec. 31, 2018
Maximum potential undiscounted payments								122,000,000	172,000,000	40,000,000	25,000,000
Percentage of credit agreement agreed to reimburse											50.00%
Guarantee obligation current carrying value							2,000,000
Guarantee obligations maximum exposure per event								50,000,000
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees	4,200,000,000		2,370,000,000			825,000,000
Maximum earnout provision payable to the company				$ 700,000,000	$ 700,000,000