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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.

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