Other Income, Net - Other Income, Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Income Net [Abstract]
Gain (loss) on asset sales, net	$ 41	$ 1	$ 87	$ 2
Refinery Income, net	13	20	22	27
Gain on sale of investments, net		280	5	280
Interest	1	4	3	10
Development projects, net		1	2	9
Canadian Oil Sands dividends				21
Impairment of marketable securities	(3)	(41)	(4)	(52)
Foreign currency exchange, net	20	19	(5)	56
Other	7	6	18	13
Other Income, net	$ 79	$ 290	$ 128	$ 366