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Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net decrease (increase) in operating working capital    
(Increase) decrease in accounts and notes receivable $ (335) $ 317
Increase in inventories (543) (550)
(Increase) decrease in prepaid expenses and other current assets (608) 26
Decrease in accounts payable and accrued liabilities (807) (1,090)
Increase in income and other taxes payable 189 245
Net increase in operating working capital [1] (2,104) (1,052)
Cash Payment for Interest on Debt and For Income Taxes    
Interest on debt (net of capitalized interest) 105 0
Income taxes 843 494
Net sales of marketable securities    
Marketable securities purchased (29) 0
Marketable securities sold 0 2
Net (purchases) sales of marketable securities (29) 2
Net borrowing of loans by equity affiliates    
Borrowing of loans by equity affiliates 0 (70)
Repayment of loans by equity affiliates 26 64
Net repayment (borrowing) of loans by equity affiliates 26 (6)
Net (repayments) borrowings of short-term obligations    
Repayments of short-term obligations (1,377) (2,952)
Proceeds from issuances of short-term obligations 658 3,415
Net borrowings of short-term obligations with three months or less maturity 3,933 (4,391)
Net borrowings (repayments) of short-term obligations 3,214 (3,928)
Capital expenditures    
Additions to properties, plant and equipment 2,937 3,305
Additions to investments 15 3
Current year dry hole expenditures 45 7
Capital expenditures 2,997 3,315
Expensed exploration expenditures 113 137
Assets acquired through capital lease obligations 0 1
Capital and exploratory expenditures, excluding equity affiliates 3,110 3,453
Company’s share of expenditures by equity affiliates 1,295 939
Capital and exploratory expenditures, including equity affiliates $ 4,405 $ 4,392
[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.