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Information Relating to the Consolidated Statement of Cash Flows (Tables)
 12 Months Ended
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]  
Schedule of information relating to the consolidated statement of cash flows
 
Year ended December 31
 
 
2012

 
 
2011

 
2010

Net decrease (increase) in operating working capital was composed of the following:
 
 
 
 
 
 
Decrease (increase) in accounts and
notes receivable
$
1,153

 
 
$
(2,156
)
 
$
(2,767
)
(Increase) decrease in inventories
(233
)
 
 
(404
)
 
15

Increase in prepaid expenses and other current assets
(471
)
 
 
(853
)
 
(542
)
Increase in accounts payable and accrued liabilities
544

 
 
3,839

 
3,049

(Decrease) increase in income and other taxes payable
(630
)
 
 
1,892

 
321

Net decrease in operating working capital
$
363

 
 
$
2,318

 
$
76

Net cash provided by operating activities includes the following cash payments for interest and income taxes:
 
 
 
 
 
 
Interest paid on debt
(net of capitalized interest)
$
—

 
 
$
—

 
$
34

Income taxes
$
17,334

 
 
$
17,374

 
$
11,749

Net sales of marketable securities consisted of the following gross amounts:
 
 
 
 
 
 
Marketable securities purchased
$
(35
)
 
 
$
(112
)
 
$
(90
)
Marketable securities sold
32

 
 
38

 
41

Net purchases of marketable securities
$
(3
)
 
 
$
(74
)
 
$
(49
)
Net sales (purchases) of time deposits consisted of the following gross amounts:
 
 
 
 
 
 
Time deposits purchased
$
(717
)
 
 
$
(6,439
)
 
$
(5,060
)
Time deposits matured
3,967

 
 
5,335

 
2,205

Net sales (purchases) of time deposits
$
3,250

 
 
$
(1,104
)
 
$
(2,855
)
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
 
 
2012

 
 
2011

 
2010

Additions to properties, plant
and equipment *
$
29,526

 
 
$
25,440

 
$
18,474

Additions to investments
1,042

 
 
900

 
861

Current-year dry hole expenditures
475

 
 
332

 
414

Payments for other liabilities
and assets, net
(105
)
 
 
(172
)
 
(137
)
Capital expenditures
30,938

 
 
26,500

 
19,612

Expensed exploration expenditures
1,173

 
 
839

 
651

Assets acquired through capital lease obligations and other financing obligations
1

 
 
32

 
104

Capital and exploratory expenditures, excluding equity affiliates
32,112

 
 
27,371

 
20,367

Company's share of expenditures by equity affiliates
2,117

 
 
1,695

 
1,388

Capital and exploratory expenditures, including equity affiliates
$
34,229

 
 
$
29,066

 
$
21,755

* Excludes noncash additions of $4,569 in 2012, $945 in 2011 and $2,753 in 2010.