Other Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total financing interest and debt costs	$ 753	$ 495	$ 358
Less: Capitalized interest	552	495	358
Interest and debt expense	201	0	0
Research and development expenses	476	601	707
Excess of replacement cost over the carrying value of inventories (LIFO method)	2,942	3,745	8,135
LIFO (losses) / profits on inventory drawdowns included in earnings	(88)	(65)	13
Foreign currency effects	58	769	487
Gains on sale of nonstrategic properties	800	2,300
Gain (loss) for impairments and other assets write-offs	2,900	3,000
Company share of equity affiliates foreign currency effects	1	344	$ 118
Goodwill	4,581	4,588
Downstream [Member]
Segment Reporting Information [Line Items]
Gains on sale of nonstrategic properties	600	1,800
Gain (loss) for impairments and other assets write-offs	110
Upstream [Member]
Segment Reporting Information [Line Items]
Gains on sale of nonstrategic properties	$ 200	$ 500