Discontinued Operations - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended			1 Months Ended
	Sep. 30, 2014 Lease	Nov. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Goodwill included in the divested businesses' net book value			$ 126,000,000	$ 339,000,000
Effect of LIFO inventory liquidation on income, Before tax	275,000,000	678,000,000			165,000,000
Effect of LIFO inventory liquidation on income, After tax	171,000,000	414,000,000			104,000,000
Impairment, environmental, severance and business exit charges, pre-tax	308,000,000	523,000,000			43,000,000
Impairment, environmental, severance and business exit charges, after-tax	202,000,000	334,000,000			33,000,000
Charge related to termination of lease contracts and the purchase of retail gasoline stations, before tax	115,000,000
Charge related to termination of lease contracts and the purchase of retail gasoline stations, after tax	72,000,000
Number of retail gasoline station leases, buyout	180
Goodwill acquired during period			115,000,000
WilcoHess [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Percentage of equity interest						56.00%
Equity interest on fair value						44.00%
Business acquisition, cost of acquired entity, purchase price						290,000,000
Adjustments of equity investment to fair value, pre-tax gain						39,000,000
Adjustments of equity investment to fair value, after income taxes						24,000,000
Goodwill acquired during period						115,000,000
Discontinued Operations [Member] | U.S. East Coast Terminal Network, St. Lucia Terminal and Related Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from sale of retail business				1,000,000,000
Gain (loss) on asset sale, pre-tax				739,000,000
Gain (loss) on asset sale, after-tax				531,000,000
Discontinued Operations [Member] | Energy Marketing Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from sale of retail business		1,200,000,000
Gain (loss) on asset sale, pre-tax		761,000,000
Gain (loss) on asset sale, after-tax		464,000,000
Discontinued Operations [Member] | Retail Business Disposal [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from sale of retail business	2,800,000,000
Gain (loss) on asset sale, pre-tax	954,000,000
Gain (loss) on asset sale, after-tax	602,000,000
Goodwill included in the divested businesses' net book value	$ 115,000,000