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Information Relating to the Consolidated Statement of Cash Flows (Tables)
 12 Months Ended
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.