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Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Net decrease (increase) in operating working capital    
Decrease (increase) in accounts and notes receivable $ 265 $ (455)
(Increase) decrease in inventories (436) 232
Decrease in prepaid expenses and other current assets 196 844
Decrease in accounts payable and accrued liabilities (729) (1,783)
Increase (decrease) in income and other taxes payable 9 (104)
Net increase in operating working capital (695) (1,266)
Cash Payment for Interest on Debt and For Income Taxes    
Interest on debt (net of capitalized interest) 30 28
Income taxes 2,203 1,492
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 (142) (2,271)
Repayment of loans by equity affiliates 106 76
Net borrowing of loans by equity affiliates (36) (2,195)
Net sales of other short-term investments    
Purchases of other short-term investments (26) 0
Sales of other short-term investments 7 155
Net (purchases) sales of other short-term investments (19) 155
Net (repayments) borrowings of short-term obligations    
Repayments of short-term obligations (8,403) (8,415)
Proceeds from issuances of short-term obligations 3,415 11,695
Net borrowings of short-term obligations with three months or less maturity (2,197) (2,411)
Net (repayments) borrowings of short-term obligations (7,185) 869
Capital expenditures    
Additions to properties, plant and equipment 9,615 13,757
Additions to investments 16 38
Current year dry hole expenditures 131 305
Payments for other liabilities and assets, net 1 0
Capital expenditures 9,763 14,100
Expensed exploration expenditures 368 370
Assets acquired through capital lease obligations 3 4
Capital and exploratory expenditures, excluding equity affiliates 10,134 14,474
Company’s share of expenditures by equity affiliates 3,252 2,693
Capital and exploratory expenditures, including equity affiliates $ 13,386 $ 17,167