Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net decrease (increase) in operating working capital
Decrease (increase) in accounts and notes receivable	$ 927	$ (858)
Increase in inventories	(704)	(219)
Decrease in prepaid expenses and other current assets	498	23
Decrease in accounts payable and accrued liabilities	(2,175)	(699)
Increase (decrease) in income and other taxes payable	256	(338)
Net increase in operating working capital	(1,198)	(2,091)
Cash Payment for Interest on Debt and For Income Taxes
Interest on debt (net of capitalized interest)	64	50
Income taxes	1,023	1,297
Net sales of marketable securities
Marketable securities purchased	(3)	(9)
Marketable securities sold	3	11
Net sales of marketable securities	0	2
Net borrowing of loans by equity affiliates
Borrowing of loans by equity affiliates	(102)	(171)
Repayment of loans by equity affiliates	86	13
Net borrowing of loans by equity affiliates	(16)	(158)
Net sales of other short-term investments
Purchases of other short-term investments	(21)	(3)
Sales of other short-term investments	7	158
Net (purchases) sales of other short-term investments	(14)	155
Net (repayments) borrowings of short-term obligations
Repayments of short-term obligations	(6,524)	(5,175)
Proceeds from issuances of short-term obligations	3,415	8,494
Net borrowings of short-term obligations with three months or less maturity	(3,196)	(2,960)
Net (repayments) borrowings of short-term obligations	(6,305)	359
Capital expenditures
Additions to properties, plant and equipment	6,521	9,796
Additions to investments	7	27
Current year dry hole expenditures	10	211
Payments for other liabilities and assets, net	1	1
Capital expenditures	6,539	10,035
Expensed exploration expenditures	250	250
Assets acquired through capital lease obligations	3	4
Capital and exploratory expenditures, excluding equity affiliates	6,792	10,289
Company’s share of expenditures by equity affiliates	2,138	1,703
Capital and exploratory expenditures, including equity affiliates	$ 8,930	$ 11,992