Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 152	$ 47
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation, depletion and amortization	416	394
Impairments and other charges	61	265
Changes in assets and liabilities:
Receivables	(339)	(245)
Inventories	(236)	(119)
Accounts payable	60	276
Other	(158)	(46)
Total cash flows provided by operating activities	(44)	572
Cash flows from investing activities:
Capital expenditures	(437)	(501)
Proceeds from sales of property, plant and equipment	43	47
Other investing activities	(17)	80
Total cash flows used in investing activities	(411)	(374)
Cash flows from financing activities:
Dividends to shareholders	(157)	(158)
Other financing activities	2	(21)
Total cash flows used in financing activities	(155)	(179)
Effect of exchange rate changes on cash	(18)	(24)
Decrease in cash and equivalents	(628)	(5)
Cash and equivalents at beginning of period	2,008	2,337
Cash and equivalents at end of period	1,380	2,332
Cash payments during the period for:
Interest	128	144
Income taxes	$ 81	$ 85