Information Relating to the Consolidated Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Net (increase) decrease in operating working capital
(Increase) decrease in accounts and notes receivable	$ (904)	$ 757
Increase in inventories	(749)	(2,068)
Decrease (increase) in prepaid expenses and other current assets	298	(841)
Increase in accounts payable and accrued liabilities	98	25
Decrease in income and other taxes payable	(831)	(821)
Net increase in operating working capital	(2,088)	(2,948)
Cash Payment for Interest on Debt and For Income Taxes
Interest on debt (net of capitalized interest)	0	32
Income taxes	10,209	14,345
Net (purchases) sales of time deposits
Time deposits purchased	(2,316)	(17)
Time deposits matured	1,716	3,967
Net (purchases) sales of time deposits	(600)	3,950
Net sales of marketable securities
Marketable securities purchased	(7)	(35)
Marketable securities sold	10	31
Net sales of marketable securities	3	(4)
Capital expenditures
Additions to properties, plant and equipment	25,557	19,310
Additions to investments	626	782
Current year dry hole expenditures	268	440
Payments for other liabilities and assets, net	(79)	(80)
Capital expenditures	26,372	20,452
Expensed exploration expenditures	790	853
Assets acquired through capital lease obligations	3	0
Capital and exploratory expenditures, excluding equity affiliates	27,165	21,305
Company's share of expenditures by equity affiliates	1,754	1,368
Capital and exploratory expenditures, including equity affiliates	$ 28,919	$ 22,673