Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended	1 Months Ended
	Sep. 30, 2014	Jun. 30, 2014 Lease	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Retail Business Disposal [Member]	Jan. 31, 2014 WilcoHess [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				126,000,000		115,000,000
Impairment, environmental, severance and business exit charges, pre-tax	173,000,000		191,000,000	254,000,000	390,000,000
Impairment, environmental, severance and business exit charges, after-tax	110,000,000		120,000,000	161,000,000	245,000,000
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
Effect of LIFO inventory liquidation on income, Before tax	183,000,000		228,000,000	247,000,000	446,000,000
Effect of LIFO inventory liquidation on income, After tax	114,000,000		143,000,000	154,000,000	280,000,000
Number of retail gasoline station leases, buyout		180
Percentage of equity interest							56.00%
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			$ 115,000,000