Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ 47	$ (32)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation, depletion and amortization	394	383
Impairments and other charges	312	0
Changes in assets and liabilities:
Receivables	(245)	(178)
Accounts payable	276	228
Inventories	(119)	(18)
Other	(93)	(378)
Total cash flows provided by operating activities	572	5
Cash flows from investing activities:
Capital expenditures	(501)	(265)
Proceeds from sales of property, plant and equipment	47	41
Other investing activities	80	(13)
Total cash flows used in investing activities	(374)	(237)
Cash flows from financing activities:
Dividends to shareholders	(158)	(156)
Payments on long-term borrowings	(9)	(1,566)
Other financing activities	(12)	63
Total cash flows used in financing activities	(179)	(1,659)
Effect of exchange rate changes on cash	(24)	(11)
Decrease in cash and equivalents	(5)	(1,902)
Cash and equivalents at beginning of period	2,337	4,009
Cash and equivalents at end of period		2,107
Cash and equivalents at end of period	2,332
Cash payments during the period for:
Interest	144	173
Income taxes	$ 85	$ 77