Information Relating to the Consolidated Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net (increase) decrease in operating working capital was composed of the following:
(Increase) decrease in accounts and notes receivable	$ (1,101)		$ 1,153		$ (2,156)
Increase in inventories	(237)		(233)		(404)
Decrease (increase) in prepaid expenses and other current assets	834		(471)		(853)
Increase in accounts payable and accrued liabilities	160		544		3,839
(Decrease) increase in income and other taxes payable	(987)		(630)		1,892
Net (increase) decrease in operating working capital	(1,331)		363		2,318
Net cash provided by operating activities includes the following cash payments for income taxes:
Income taxes	12,898		17,334		17,374
Net sales (purchases) of marketable securities consisted of the following gross amounts:
Marketable securities purchased	(7)		(35)		(112)
Marketable securities sold	10		32		38
Net sales (purchases) of marketable securities	3		(3)		(74)
Net sales (purchases) of time deposits consisted of the following gross amounts:
Time deposits purchased	(2,317)		(717)		(6,439)
Time deposits matured	3,017		3,967		5,335
Net sales (purchases) of time deposits	700		3,250		(1,104)
Capital expenditures
Additions to properties, plant and equipment	36,550	[1]	29,526	[1]	25,440	[1]
Additions to investments	934		1,042		900
Current-year dry hole expenditures	594		475		332
Payments for other liabilities and assets, net	(93)		(105)		(172)
Capital expenditures	37,985		30,938		26,500
Expensed exploration expenditures	1,178		1,173		839
Assets acquired through capital lease obligations and other financing obligations	16		1		32
Capital and exploratory expenditures, excluding equity affiliates	39,179		32,112		27,371
Company's share of expenditures by equity affiliates	2,698		2,117		1,695
Capital and exploratory expenditures, including equity affiliates	$ 41,877		$ 34,229		$ 29,066

[1] Excludes noncash additions of $1,661 in 2013, $4,569 in 2012 and $945 in 2011.