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Information Relating to the Consolidated Statement of Cash Flows (Tables)
 3 Months Ended
Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Net increase in operating working capital
The “Net increase in operating working capital” was composed of the following operating changes:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
(Increase) decrease in accounts and notes receivable
$
(335
)
 
$
317

Increase in inventories
(543
)
 
(550
)
(Increase) decrease in prepaid expenses and other current assets 1
(608
)
 
26

Decrease in accounts payable and accrued liabilities 1
(807
)
 
(1,090
)
Increase in income and other taxes payable
189

 
245

Net increase in operating working capital 1
$
(2,104
)
 
$
(1,052
)
____________________
 
 
 
1   2017 adjusted to conform to Accounting Standards Update 2016-18.
Cash payment for interest on debt and for income taxes
“Net Cash Provided by Operating Activities” included the following cash payments for interest on debt and for income taxes:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Interest on debt (net of capitalized interest)
$
105

 
$
—

Income taxes
843

 
494
Net sales of marketable securities
The “Net (purchases) sales of marketable securities” consisted of the following gross amounts:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Marketable securities purchased
$
(29
)
 
$
—

Marketable securities sold
—

 
2

Net (purchases) sales of marketable securities
$
(29
)
 
$
2
Schedule of net borrowing of loans by equity affiliates
The “Net repayment (borrowing) of loans by equity affiliates” consisted of the following gross amounts:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Borrowing of loans by equity affiliates
$
—

 
$
(70
)
Repayment of loans by equity affiliates
26

 
64

Net repayment (borrowing) of loans by equity affiliates
$
26

 
$
(6
)
Schedule of short-term debt
The “Net borrowings (repayments) of short-term obligations" consisted of the following gross and net amounts:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Repayments of short-term obligations
$
(1,377
)
 
$
(2,952
)
Proceeds from issuances of short-term obligations
658

 
3,415

Net borrowings of short-term obligations with three months or less maturity
3,933

 
(4,391
)
Net borrowings (repayments) of short-term obligations
$
3,214

 
$
(3,928
)
Capital expenditures
The major components of “Capital expenditures” and the reconciliation of this amount to the capital and exploratory expenditures, including equity affiliates, are as follows:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Additions to properties, plant and equipment
$
2,937

 
$
3,305

Additions to investments
15

 
3

Current year dry hole expenditures
45

 
7

 Capital expenditures
2,997

 
3,315

Expensed exploration expenditures
113

 
137

Assets acquired through capital lease obligations
—

 
1

 Capital and exploratory expenditures, excluding equity affiliates
3,110

 
3,453

Company’s share of expenditures by equity affiliates
1,295

 
939

 Capital and exploratory expenditures, including equity affiliates
$
4,405

 
$
4,392
Schedule of cash, cash equivalents and restricted cash
The table on the next page quantifies the beginning and ending balances of restricted cash and restricted cash equivalents in the Consolidated Balance Sheet:

 
 
At March 31
 
At December 31
 
 
2018
 
2017
 
2017
 
2016
 
 
(Millions of dollars)
 
(Millions of dollars)
Cash and Cash Equivalents
 
$
6,466

 
$
6,983

 
$
4,813

 
$
6,988

Restricted cash included in "Prepaid expenses and other current assets"
 
316

 
306

 
405

 
488

Restricted cash included in "Deferred charges and other assets"
 
735

 
784

 
725

 
938

Total Cash, Cash Equivalents and Restricted Cash
 
$
7,517

 
$
8,073

 
$
5,943

 
$
8,414