Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Sales and other operating revenues, including related party	$ 2,830		$ 3,354
Marketing revenues	540		430
Total revenues	3,370		3,784
Income from equity method investments	137		118
Net gain on disposal of assets and other income	22		118
Production	613		564
Marketing, including purchases from related parties	540		429
Exploration	76		463
Depreciation, depletion and amortization	697		720
Impairments	17		38
Other expense	306	[1]	283	[1]
Taxes other than income	98		84
Net interest and other	52		72
Income tax provision (benefit)	590		987
Segment income/Income from continuing operations Attributable to Parent	540		380
Capital expenditures	1,109	[2]	1,216	[2]
North America Exploration and Production [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues, including related party	1,392		1,215
Marketing revenues	440		345
Total revenues	1,832		1,560
Income from equity method investments	0		0
Net gain on disposal of assets and other income	3		0
Production	211		184
Marketing, including purchases from related parties	440		347
Exploration	57		435
Depreciation, depletion and amortization	515		478
Impairments	17		23
Other expense	110	[1]	106	[1]
Taxes other than income	90		76
Net interest and other	0		0
Income tax provision (benefit)	153		(30)
Segment income/Income from continuing operations Attributable to Parent	242		(59)
Capital expenditures	867	[2]	970	[2]
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues, including related party	1,061		1,801
Marketing revenues	69		85
Total revenues	1,130		1,886
Income from equity method investments	137		118
Net gain on disposal of assets and other income	17		16
Production	171		109
Marketing, including purchases from related parties	69		82
Exploration	19		28
Depreciation, depletion and amortization	125		180
Impairments	0		0
Other expense	54	[1]	65	[1]
Taxes other than income	3		2
Net interest and other	0		0
Income tax provision (benefit)	512		1,100
Segment income/Income from continuing operations Attributable to Parent	331		454
Capital expenditures	171	[2]	171	[2]
Oil Sands Mining Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues, including related party	377		388
Marketing revenues	31		0
Total revenues	408		388
Income from equity method investments	0		0
Net gain on disposal of assets and other income	2		0
Production	231		271
Marketing, including purchases from related parties	31		0
Exploration	0		0
Depreciation, depletion and amortization	45		52
Impairments	0		0
Other expense	13	[1]	8	[1]
Taxes other than income	5		6
Net interest and other	0		0
Income tax provision (benefit)	21		13
Segment income/Income from continuing operations Attributable to Parent	64		38
Capital expenditures	68	[2]	45	[2]
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues, including related party	0		(50)	[3]
Marketing revenues	0		0
Total revenues	0		(50)
Income from equity method investments	0		0
Net gain on disposal of assets and other income	0		102
Production	0		0
Marketing, including purchases from related parties	0		0
Exploration	0		0
Depreciation, depletion and amortization	12		10
Impairments	0		15
Other expense	129	[1],[4]	104	[1]
Taxes other than income	0		0
Net interest and other	52		72
Income tax provision (benefit)	(96)		(96)
Segment income/Income from continuing operations Attributable to Parent	(97)		(53)
Capital expenditures	$ 3	[2]	$ 30	[2]

[1] Includes other operating expenses and general and administrative expenses.

[2] Includes accruals.

[3] Unrealized loss on crude oil derivative instruments.

[4] Includes pension settlement loss of $63 million.