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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 810 $ 170 $ 110
Items to reconcile net income and cash flows from operating activities:      
Depreciation and amortization 650 696 736
Interest and amortization of issuance costs on convertible bonds 34 22 21
Loss on financial instruments, net 16    
Non-cash stock-based compensation 61 38 38
Other non-cash items (85) (85) (108)
Deferred income tax 60 (34) (93)
(Income) loss on equity-method investments 2 (7) (2)
Impairment, restructuring charges and other related closure costs, net of cash payments (6) 34 20
Changes in assets and liabilities:      
Trade receivables, net (206) (121) 81
Inventories (94) 63 (39)
Trade payables 141 68 (46)
Other assets and liabilities, net 324 199 128
Net cash from operating activities 1,707 1,043 846
Cash flows from investing activities:      
Payment for purchase of tangible assets (1,301) (611) (529)
Proceeds from sale of tangible assets 3 4 62
Payment for purchase of marketable securities (99)    
Net cash variation for joint ventures deconsolidation     (1)
Payment for purchase of intangible assets (71) (42) (36)
Payment for disposal of equity investment     (13)
Proceeds from sale of financial assets     1
Payment for business acquisitions, net of cash and cash equivalents acquired   (78)  
Net cash used in investing activities (1,468) (727) (516)
Cash flows from financing activities:      
Proceeds from long-term debt 7 13  
Net proceeds from issuance of senior unsecured convertible bonds 1,502    
Repayment of long-term debt (119) (191) (200)
Repayment of issued debt (1,000)    
Repurchase of common stock (297)    
Dividends paid to stockholders (214) (251) (350)
Dividends paid to noncontrolling interests (6) (6) (6)
Payment of withholding tax on vested shares (9) (3) (4)
Other financing activities   (1)  
Net cash used in financing activities (136) (439) (560)
Effect of changes in exchange rates 27 (19) (16)
Net cash increase (decrease) 130 (142) (246)
Cash and cash equivalents at beginning of the period 1,629 1,771 2,017
Cash and cash equivalents at end of the period 1,759 1,629 1,771
Supplemental cash information:      
Interest paid 12 13 15
Income tax paid $ 52 $ 42 $ 41