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Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Net decrease (increase) in operating working capital    
Decrease (increase) in accounts and notes receivable $ (1,379) $ 927
Decrease (increase) in inventories (1,075) (704)
Decrease (increase) in prepaid expenses and other current assets (433) 408
Increase (decrease) in accounts payable and accrued liabilities 704 (2,141)
Increase (decrease) in income and other taxes payable (104) 256
Net decrease (increase) in operating working capital [1] (2,287) (1,254)
Cash Payment for Interest on Debt and For Income Taxes    
Interest on debt (net of capitalized interest) 373 64
Income taxes 2,335 1,023
Net sales of marketable securities    
Marketable securities purchased (49) (3)
Marketable securities sold 0 3
Net sales (purchases) of marketable securities (49) 0
Net borrowing of loans by equity affiliates    
Borrowing of loans by equity affiliates 0 (102)
Repayment of loans by equity affiliates 52 86
Net repayment (borrowing) of loans by equity affiliates 52 (16)
Net (repayments) borrowings of short-term obligations    
Repayments of short-term obligations (2,212) (6,524)
Proceeds from issuances of short-term obligations 1,771 3,415
Net borrowings (repayments) of short-term obligations with three months or less maturity 5,142 (3,196)
Net borrowings (repayments) of short-term obligations 4,701 (6,305)
Capital expenditures    
Additions to properties, plant and equipment 6,097 6,521
Additions to investments 21 7
Current year dry hole expenditures 105 10
Payments for other liabilities and assets, net 0 1
Capital expenditures 6,223 6,539
Expensed exploration expenditures 229 250
Assets acquired through capital lease obligations 65 3
Capital and exploratory expenditures, excluding equity affiliates 6,517 6,792
Company’s share of expenditures by equity affiliates 2,704 2,138
Capital and exploratory expenditures, including equity affiliates $ 9,221 $ 8,930
[1] 2017 adjusted to conform to Accounting Standards Update 2016-18. Refer to Note 4, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 8.