Information Relating to the Consolidated Statement of Cash Flows (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Net increase in operating working capital
Increase in accounts and notes receivable	$ (2,756)	$ (124)
Increase in inventories	(1,823)	(382)
Decrease (Increase) in prepaid expenses and other current assets	84	(329)
Increase (decrease) in accounts payable and accrued liabilities	2,980	(272)
Increase in income and other taxes payable	1,336	740
Net increase in operating working capital	(179)	(367)
Net Cash Provided by Operating Activities
Interest on debt (net of capitalized interest)		34
Income taxes	8,554	5,936
Net purchases of time deposits
Time deposits purchased	(3,980)	(4,348)
Time deposits matured	2,427	595
Net purchases of time deposits	(1,553)	(3,753)
Net (purchase) sales of marketable securities
Marketable securities purchased	(86)
Marketable securities sold	33	39
Net sales of marketable securities	(53)	39
Capital expenditures
Additions to properties, plant and equipment	11,877	8,080
Additions to investments	410	391
Current year dry hole expenditures	195	116
Payments for other liabilities and assets, net	(64)	(68)
Capital expenditures	12,418	8,519
Expensed exploration expenditures	386	264
Assets acquired through capital lease obligations	1	33
Capital and exploratory expenditures, excluding equity affiliates	12,805	8,816
Company's share of expenditures by equity affiliates	584	609
Capital and exploratory expenditures, including equity affiliates	$ 13,389	$ 9,425