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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

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