Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 585	$ 304
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	312	295
Stock-based compensation expense	11	11
Loss from disposition of property, plant and equipment	15	7
Deferred income taxes	45	15
Other gains, net	0	(1)
Changes in operating assets and liabilities
Accounts receivable	(272)	(142)
Inventories	(9)	21
Prepaid expenses and other current assets	(13)	5
Accounts payable	(11)	82
Accrued liabilities	(70)	(87)
Other, net	(44)	(30)
Net cash provided by operating activities	549	480
Cash flows from investing activities
Additions to property, plant and equipment	(312)	(281)
Additions to investments in unconsolidated subsidiaries	(45)	(31)
Other	3	2
Net cash used for investing activities	(354)	(310)
Cash flows from financing activities
Dividends paid	(54)	(49)
Distributions to noncontrolling interests	(29)	(16)
Proceeds from notes payable and drawdown of revolver	6	178
Repayment of term loan	0	(150)
Repayment of revolver	0	(360)
Redemption and repayment of notes payable	(1,173)	(5)
Other	8	1
Net cash used for financing activities	(1,242)	(401)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2)	13
Net decrease in cash, cash equivalents and restricted cash	(1,049)	(218)
Cash, cash equivalents and restricted cash at beginning of period	1,554	646
Cash, cash equivalents and restricted cash at end of period	$ 505	$ 428