Information Relating to the Consolidated Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net decrease (increase) in operating working capital
Decrease (increase) in accounts and notes receivable	$ 1,388	$ (904)
Increase in inventories	(931)	(749)
Decrease in prepaid expenses and other current assets	237	298
(Decrease) increase in accounts payable and accrued liabilities	(946)	98
Decrease in income and other taxes payable	(124)	(831)
Net increase in operating working capital	(376)	(2,088)
Cash Payment for Interest on Debt and For Income Taxes
Income taxes	8,625	10,209
Net (purchases) sales of time deposits
Time deposits purchased	(317)	(2,316)
Time deposits matured	317	1,716
Net (purchases) sales of time deposits	0	(600)
Net sales of marketable securities
Marketable securities purchased	(11)	(7)
Marketable securities sold	12	10
Net sales of marketable securities	1	3
Capital expenditures
Additions to properties, plant and equipment	25,094	25,557
Additions to investments	341	626
Current year dry hole expenditures	320	268
Payments for other liabilities and assets, net	(16)	(79)
Capital expenditures	25,739	26,372
Expensed exploration expenditures	853	790
Assets acquired through capital lease obligations	12	3
Capital and exploratory expenditures, excluding equity affiliates	26,604	27,165
Company's share of expenditures by equity affiliates	2,422	1,754
Capital and exploratory expenditures, including equity affiliates	$ 29,026	$ 28,919