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Information Relating to the Consolidated Statement of Cash Flows (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]  
Schedule of information relating to the consolidated statement of cash flows
 
Year ended December 31
 
 
2015

 
 
2014

 
2013

Net increase in operating working capital was composed of the following:
 
 
 
 
 
 
Decrease (increase) in accounts and notes receivable
$
3,631

 
 
$
4,491

 
$
(1,101
)
Decrease (increase) in inventories
85

 
 
(146
)
 
(237
)
Decrease (increase) in prepaid expenses and other current assets
713

 
 
(407
)
 
834

(Decrease) increase in accounts payable and accrued liabilities
(5,769
)
 
 
(3,737
)
 
160

Decrease in income and other taxes payable
(639
)
 
 
(741
)
 
(987
)
Net increase in operating working capital
$
(1,979
)
 
 
$
(540
)
 
$
(1,331
)
Net cash provided by operating activities includes the following cash payments for income taxes:
 
 
 
 
 
 
Income taxes
$
4,645

 
 
$
10,562

 
$
12,898

Net sales (purchases) of marketable securities consisted of the following gross amounts:
 
 
 
 
 
 
Marketable securities purchased
$
(6
)
 
 
$
(162
)
 
$
(7
)
Marketable securities sold
128

 
 
14

 
10

Net sales (purchases) of marketable securities
$
122

 
 
$
(148
)
 
$
3

Net maturities of time deposits consisted of the following gross amounts:
 
 
 
 
 
 
Investments in time deposits
$
—

 
 
$
(317
)
 
$
(2,317
)
Maturities of time deposits
8

 
 
317

 
3,017

Net maturities of time deposits
$
8

 
 
$
—

 
$
700

Net (repayments) borrowings of short-term obligations consisted of the following gross and net amounts:
 
 
 
 
 
 
Proceeds from issuances of short-term obligations
$
13,805

 
 
$
9,070

 
$
1,551

Repayments of short-term obligations
(16,379
)
 
 
(4,612
)
 
(375
)
Net borrowings (repayments) of short-term obligations with three months or less maturity
2,239

 
 
(1,027
)
 
1,202

Net (repayments) borrowings of short-term obligations
$
(335
)
 
 
$
3,431

 
$
2,378
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
 
 
2015

 
 
2014

 
2013

Additions to properties, plant and equipment *
$
28,213

 
 
$
34,393

 
$
36,550

Additions to investments
555

 
 
526

 
934

Current-year dry hole expenditures
736

 
 
504

 
594

Payments for other liabilities and assets, net
—

 
 
(16
)
 
(93
)
Capital expenditures
29,504

 
 
35,407

 
37,985

Expensed exploration expenditures
1,031

 
 
1,110

 
1,178

Assets acquired through capital lease obligations and other financing obligations
47

 
 
332

 
16

Capital and exploratory expenditures, excluding equity affiliates
30,582

 
 
36,849

 
39,179

Company's share of expenditures by equity affiliates
3,397

 
 
3,467

 
2,698

Capital and exploratory expenditures, including equity affiliates
$
33,979

 
 
$
40,316

 
$
41,877

* 
Excludes noncash additions of $1,362 in 2015, $2,310 in 2014 and $1,661 in 2013.