Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net decrease (increase) in operating working capital
Decrease in accounts and notes receivable	$ 2,337	$ 1,388
Increase in inventories	(445)	(931)
Decrease in prepaid expenses and other current assets	167	237
Decrease in accounts payable and accrued liabilities	(3,769)	(946)
Decrease in income and other taxes payable	(611)	(124)
Net increase in operating working capital	(2,321)	(376)
Cash Payment for Interest on Debt and For Income Taxes
Income taxes	4,081	8,625
Net (purchases) sales of time deposits
Time deposits purchased	0	(317)
Time deposits matured	8	317
Net (purchases) sales of time deposits	8	0
Net sales of marketable securities
Marketable securities purchased	(6)	(11)
Marketable securities sold	128	12
Net sales of marketable securities	122	1
Capital expenditures
Additions to properties, plant and equipment	21,273	25,094
Additions to investments	382	341
Current year dry hole expenditures	400	320
Payments for other liabilities and assets, net	0	(16)
Capital expenditures	22,055	25,739
Expensed exploration expenditures	717	853
Assets acquired through capital lease obligations	44	12
Capital and exploratory expenditures, excluding equity affiliates	22,816	26,604
Company's share of expenditures by equity affiliates	2,456	2,422
Capital and exploratory expenditures, including equity affiliates	$ 25,272	$ 29,026