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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.

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