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Information Relating to the Consolidated Statement of Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Schedule of information relating to the consolidated statement of cash flows |
| Year ended December 31 |
| 2017 |  |  |  | 2016 |  |  | 2015 |
Net decrease (increase) in operating working capital was composed of the following: |  |  |  |  |  |
(Increase) decrease in accounts and notes receivable | $ | (915 | ) |  |  | $ | (2,121 | ) |  | $ | 3,631 |
(Increase) decrease in inventories | (267 | ) |  |  | 603 |  |  | 85 |
Decrease in prepaid expenses and other current assets | 252 |  |  |  | 439 |  |  | 713 |
Increase (decrease) in accounts payable and accrued liabilities | 875 |  |  |  | 533 |  |  | (5,769 | )
Increase (decrease) in income and other taxes payable | 531 |  |  |  | (4 | ) |  | (639 | )
Net decrease (increase) in operating working capital | $ | 476 |  |  |  | $ | (550 | ) |  | $ | (1,979 | )
Net cash provided by operating activities includes the following cash payments for interest on debt and for income taxes: |  |  |  |  |  |
Interest on debt (net of capitalized interest) | $ | 265 |  |  |  | $ | 158 |  |  | $ | — |
Income taxes | 3,132 |  |  |  | 1,935 |  |  | 4,645 |
Net sales of marketable securities consisted of the following gross amounts: |  |  |  |  |  |
Marketable securities purchased | $ | (3 | ) |  |  | $ | (9 | ) |  | $ | (6 | )
Marketable securities sold | 7 |  |  |  | 306 |  |  | 128 |
Net sales of marketable securities | $ | 4 |  |  |  | $ | 297 |  |  | $ | 122 |
Net maturities of time deposits consisted of the following gross amounts: |  |  |  |  |  |
Investments in time deposits | $ | — |  |  |  | $ | — |  |  | $ | — |
Maturities of time deposits | — |  |  |  | — |  |  | 8 |
Net maturities of time deposits | $ | — |  |  |  | $ | — |  |  | $ | 8 |
Net (borrowing) repayment of loans by equity affiliates: |  |  |  |  |  |
Borrowing of loans by equity affiliates | $ | (142 | ) |  |  | $ | (2,341 | ) |  | $ | (223 | )
Repayment of loans by equity affiliates | 126 |  |  |  | 307 |  |  | 6 |
Net (borrowing) repayment of loans by equity affiliates | $ | (16 | ) |  |  | $ | (2,034 | ) |  | $ | (217 | )
Net (purchases) sales of other short-term investments: |  |  |  |  |  |
Purchases of other short-term investments | $ | (41 | ) |  |  | $ | (1 | ) |  | $ | (75 | )
Sales of other short-term investments | 9 |  |  |  | 218 |  |  | 119 |
Net (purchases) sales of other short-term investments | $ | (32 | ) |  |  | $ | 217 |  |  | $ | 44 |
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts: |  |  |  |  |  |
Proceeds from issuances of short-term obligations | $ | 5,051 |  |  |  | $ | 14,778 |  |  | $ | 13,805 |
Repayments of short-term obligations | (8,820 | ) |  |  | (12,558 | ) |  | (16,379 | )
Net (repayments) borrowings of short-term obligations with three months or less maturity | (1,373 | ) |  |  | (90 | ) |  | 2,239 |
Net (repayments) borrowings of short-term obligations | $ | (5,142 | ) |  |  | $ | 2,130 |  |  | $ | (335 | )
Capital expenditures | The major components of “Capital expenditures” and the reconciliation of this amount to the reported capital and exploratory expenditures, including equity affiliates, are presented in the following table:
| Year ended December 31 |
| 2017 |  |  |  | 2016 |  |  | 2015 |
Additions to properties, plant and equipment * | $ | 13,222 |  |  |  | $ | 17,742 |  |  | $ | 28,213 |
Additions to investments | 25 |  |  |  | 55 |  |  | 555 |
Current-year dry hole expenditures | 157 |  |  |  | 313 |  |  | 736 |
Payments for other liabilities and assets, net | — |  |  |  | (1 | ) |  | — |
Capital expenditures | 13,404 |  |  |  | 18,109 |  |  | 29,504 |
Expensed exploration expenditures | 666 |  |  |  | 544 |  |  | 1,031 |
Assets acquired through capital lease obligations and other financing obligations | 8 |  |  |  | 5 |  |  | 47 |
Capital and exploratory expenditures, excluding equity affiliates | 14,078 |  |  |  | 18,658 |  |  | 30,582 |
Company's share of expenditures by equity affiliates | 4,743 |  |  |  | 3,770 |  |  | 3,397 |
Capital and exploratory expenditures, including equity affiliates | $ | 18,821 |  |  |  | $ | 22,428 |  |  | $ | 33,979 |
* | Excludes noncash additions of $1,183 in 2017, $56 in 2016 and $1,362 in 2015.

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