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	)

A loan to Tengizchevroil LLP for the development of the Future Growth and Wellhead Pressure Management Project represents the majority of "Net borrowing of loans by equity affiliates" in 2016.

The “Net sales of treasury shares” represents the cost of common shares acquired less the cost of shares issued for share-based compensation plans. Purchases totaled $1, $2 and $2 in 2017, 2016 and 2015, respectively. No purchases were made under the company's share repurchase program in 2017, 2016, or 2015.

In 2017, 2016 and 2015, “Net (purchases) sales of other short-term investments” generally consisted of restricted cash associated with upstream abandonment activities, tax payments and certain pension fund payments that was invested in cash and short-term securities and reclassified from “Cash and cash equivalents” to “Deferred charges and other assets” on the Consolidated Balance Sheet.

The Consolidated Statement of Cash Flows excludes changes to the Consolidated Balance Sheet that did not affect cash. In 2017, an approximate $400 increase in “Deferred credits and other noncurrent obligations” and a corresponding increase to “Properties, plant and equipment, at cost” were considered non-cash transactions and excluded from “Net increase in operating working capital” and “Capital expenditures.” The amount is related to upstream operating agreements outside of the United States.

Refer also to Note 26, on page 89, for a discussion of revisions to the company’s AROs that also did not involve cash receipts or payments for the three years ending December 31, 2017.

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.