Information Relating to the Consolidated Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net (increase) decrease in operating working capital
Decrease in accounts and notes receivable	$ 504	$ 1,377
Increase in inventories	(1,279)	(1,359)
Decrease (increase) in prepaid expenses and other current assets	505	(375)
Decrease in accounts payable and accrued liabilities	(1,535)	(1,062)
Decrease in income and other taxes payable	(710)	(778)
Net increase in operating working capital	(2,515)	(2,197)
Cash Payment for Interest on Debt and For Income Taxes
Interest on debt (net of capitalized interest)	0	0
Income taxes	7,565	10,524
Net (purchases) sales of time deposits
Time deposits purchased	(1,608)	(8)
Time deposits matured	908	3,958
Net (purchases) sales of time deposits	(700)	3,950
Net sales of marketable securities
Marketable securities purchased	(5)	0
Marketable securities sold	7	11
Net sales of marketable securities	2	11
Capital expenditures
Additions to properties, plant and equipment	16,334	12,163
Additions to investments	472	437
Current year dry hole expenditures	18	404
Payments for other liabilities and assets, net	(59)	(42)
Capital expenditures	16,765	12,962
Expensed exploration expenditures	497	454
Assets acquired through capital lease obligations	2	0
Capital and exploratory expenditures, excluding equity affiliates	17,264	13,416
Company's share of expenditures by equity affiliates	1,070	827
Capital and exploratory expenditures, including equity affiliates	$ 18,334	$ 14,243