Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 1,657	$ (468)	$ (5,769)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation, depletion and amortization	1,606	1,556	1,503
Deferred income tax provision (benefit), continuing operations	(267)	734	(1,501)
Impairments and other charges	265	647	3,357	[1]
Changes in assets and liabilities:
Inventories	(681)	(29)	552
Accounts payable	483	753	(219)
Receivables	(186)	(1,350)	899
Other	280	625	(525)
Total cash flows provided by (used in) operating activities	3,157	2,468	(1,703)
Cash flows from investing activities:
Capital expenditures	(2,026)	(1,373)	(798)
Sales of investment securities	527	98	96
Purchases of investment securities	(423)	(109)	(92)
Proceeds from sales of property, plant and equipment	218	158	222
Payments to acquire businesses, net of cash acquired	(187)	(628)	(31)
Other investing activities	(102)	(73)	(107)
Total cash flows provided by (used in) investing activities	(1,993)	(1,927)	(710)
Cash flows from financing activities:
Dividends to shareholders	(630)	(626)	(620)
Payments on long-term borrowings	(445)	(1,641)	(3,171)
Stock repurchase program	(400)	0	0
Proceeds from issuance of common stock	195	158	186
Other financing activities	(139)	(52)	65
Total cash flows provided by (used in) financing activities	(1,419)	(2,161)	(3,540)
Effect of exchange rate changes on cash	(74)	(52)	(115)
Decrease in cash and equivalents	(329)	(1,672)	(6,068)
Cash and equivalents at beginning of year	2,337	4,009	10,077
Cash and equivalents at end of year	2,008	2,337	4,009
Cash payments (receipts) during the period for:
Interest	556	594	659
Income taxes	$ 178	$ (178)	$ (20)

[1] Impairments and other charges are as follows: -For the year ended December 31, 2018, the aggregate charge of $265 million represents a write-down of all of our remaining investment in Venezuela, consisting of receivables, fixed assets, inventory and other assets and liabilities. -For the year ended December 31, 2017, the aggregate charge of $647 million represents a fair market value adjustment on our existing promissory note with our primary customer in Venezuela and a full reserve against our other accounts receivable with this customer. -For the year ended December 31, 2016, the aggregate charge of $3.4 billion consisted of fixed asset impairments and write-offs, inventory write-downs, impairments of intangible assets, severance costs, country and facility closures, and other charges related to the energy downturn. This included $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation and $10 million attributable to Corporate and other.