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Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net decrease (increase) in operating working capital was composed of the following:      
(Increase) decrease in accounts and notes receivable $ (915) $ (2,121) $ 3,631
(Increase) decrease in inventories (267) 603 85
Decrease in prepaid expenses and other current assets 252 439 713
Increase (decrease) in accounts payable and accrued liabilities 875 533 (5,769)
Increase (decrease) in income and other taxes payable 531 (4) (639)
Net decrease (increase) in operating working capital 476 (550) (1,979)
Net cash provided by operating activities includes the following cash payments for interest on debt and for income taxes:      
Interest on debt (net of capitalized interest) 265 158 0
Income taxes 3,132 1,935 4,645
Net sales of marketable securities consisted of the following gross amounts:      
Marketable securities purchased (3) (9) (6)
Marketable securities sold 7 306 128
Net sales of marketable securities 4 297 122
Net maturities of time deposits consisted of the following gross amounts:      
Investments in time deposits 0 0 0
Time deposits matured 0 0 8
Net sales (purchases) of time deposits 0 0 8
Net (borrowing) repayment of loans by equity affiliates:      
Borrowing of loans by equity affiliates (142) (2,341) (223)
Repayment of loans by equity affiliates 126 307 6
Net (borrowing) repayment of loans by equity affiliates (16) (2,034) (217)
Net (purchases) sales of other short-term investments:      
Purchases of other short-term investments (41) (1) (75)
Sales of other short-term investments 9 218 119
Net (purchases) sales of other short-term investments (32) 217 44
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:      
Proceeds from issuances of short-term obligations 5,051 14,778 13,805
Repayments of short-term obligations (8,820) (12,558) (16,379)
Net (repayments) borrowings of short-term obligations with three months or less maturity (1,373) (90) 2,239
Net (repayments) borrowings of short-term obligations (5,142) 2,130 (335)
Capital expenditures      
Additions to properties, plant and equipment 13,222 17,742 28,213
Additions to investments 25 55 555
Current-year dry hole expenditures 157 313 736
Payments for other liabilities and assets, net 0 (1) 0
Capital expenditures 13,404 18,109 29,504
Expensed exploration expenditures 666 544 1,031
Assets acquired through capital lease obligations and other financing obligations 8 5 47
Capital and exploratory expenditures, excluding equity affiliates 14,078 18,658 30,582
Company's share of expenditures by equity affiliates 4,743 3,770 3,397
Capital and exploratory expenditures, including equity affiliates 18,821 22,428 33,979
Non-cash additions to properties, plant and equipment $ 1,183 $ 56 $ 1,362