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Information Relating to the Consolidated Statement of Cash Flows
 9 Months Ended
Sep. 30, 2013
Supplemental Cash Flow Elements [Abstract]  
Information Relating to the Consolidated Statement of Cash Flows
Information Relating to the Consolidated Statement of Cash Flows
The “Net increase in operating working capital” was composed of the following operating changes:
 
Nine Months Ended
September 30
 
2013
 
2012
 
(Millions of dollars)
(Increase) decrease in accounts and notes receivable
$
(904
)
 
$
757

Increase in inventories
(749
)
 
(2,068
)
Decrease (increase) in prepaid expenses and other current assets
298

 
(841
)
Increase in accounts payable and accrued liabilities
98

 
25

Decrease in income and other taxes payable
(831
)
 
(821
)
Net increase in operating working capital
$
(2,088
)
 
$
(2,948
)

The “Net increase in operating working capital” includes reductions of $73 million and $87 million for excess income tax benefits associated with stock options exercised during the nine months ended September 30, 2013, and 2012, respectively. These amounts are offset by an equal amount in “Net purchases of treasury shares.”
“Net Cash Provided by Operating Activities” included the following cash payments for interest on debt and for income taxes:
 
Nine Months Ended
September 30
 
2013
 
2012
 
(Millions of dollars)
Interest on debt (net of capitalized interest)
$
—

 
$
32

Income taxes
10,209

 
14,345


"Other" includes changes in postretirement benefits obligations and other long-term liabilities.
Information related to "Restricted Cash" is included on page 22 in Note 12 under the heading "Restricted Cash."
The “Net (purchases) sales of time deposits” consisted of the following gross amounts:
 
Nine Months Ended
September 30
 
2013
 
2012
 
(Millions of dollars)
Time deposits purchased
$
(2,316
)
 
$
(17
)
Time deposits matured
1,716

 
3,967

Net (purchases) sales of time deposits
$
(600
)
 
$
3,950


The “Net sales (purchases) of marketable securities” consisted of the following gross amounts:
 
Nine Months Ended
September 30
 
2013
 
2012
 
(Millions of dollars)
Marketable securities purchased
$
(7
)
 
$
(35
)
Marketable securities sold
10

 
31

Net sales (purchases) of marketable securities
$
3

 
$
(4
)

The “Net purchases of treasury shares” represents the cost of common shares acquired less the cost of shares issued for share-based compensation plans. Purchases totaled $3.8 billion for the first nine months periods in both 2013 and 2012. During the first nine months of 2013 and 2012, the company purchased 31.3 million and 35.1 million common shares under its ongoing share repurchase program, respectively, for $3.7 billion in each corresponding period.
The major components of “Capital expenditures” and the reconciliation of this amount to the capital and exploratory expenditures, including equity affiliates, are as follows:
 
Nine Months Ended
September 30
 
2013
 
2012
 
(Millions of dollars)
Additions to properties, plant and equipment
$
25,557

 
$
19,310

Additions to investments
626

 
782

Current year dry hole expenditures
268

 
440

Payments for other liabilities and assets, net
(79
)
 
(80
)
Capital expenditures
26,372

 
20,452

Expensed exploration expenditures
790

 
853

Assets acquired through capital lease obligations
3

 
—

Capital and exploratory expenditures, excluding equity affiliates
27,165

 
21,305

Company’s share of expenditures by equity affiliates
1,754

 
1,368

Capital and exploratory expenditures, including equity affiliates
$
28,919

 
$
22,673