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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net income (loss) $ 24 $ 481 $ 1,235
Adjustments for      
Depreciation and amortization 489 443 403
Impairment losses of fixed assets (Reversal of) 90 (10) 17
Exchange rate, interest and derivative, net 90 110 140
Loss (profit) from divestiture of businesses 4 0 (841)
Tax expenses 25 147 129
Change in provisions 113 (21) (66)
Other 1 (1) 16
Adjustments for reconcile profit loss 812 668 (202)
Change in inventories 54 (72) (115)
Change in trade receivables (89) 199 (101)
Change in trade payables 84 (58) (34)
Change in other receivables 5 5 (3)
Change in other payables 54 4 (1)
Net change in operating assets and liabilities 108 78 (254)
Interest paid (109) (115) (103)
Income taxes paid, net of refunds (31) (120) (56)
Net cash provided by operating activities 804 992 620
Cash flows from investing activities      
Proceeds (investments) in deposits, net 34 (2) (3)
Business combinations (27) 0 0
Purchases of property, plant and equipment and intangible assets (626) (576) (572)
Proceeds from divestiture of businesses net of transaction expenses 26 0 902
Dividends from equity-accounted investees 7 3 2
Proceeds from sale of property, plant and equipment 3 50 2
Net cash provided by (used in) investing activities (583) (525) 331
Cash flows from financing activities      
Dividends paid to the company's shareholders (118) (273) (241)
Receipt of long-term debt 1,175 657 1,746
Repayments of long-term debt (1,133) (689) (2,115)
Repayment of short-term debit, net (52) (183) (283)
Receipt from transactions in derivatives designated as a cash flow hedge 24 0 0
Other (1) (2) (1)
Net cash used in financing activities (105) (490) (894)
Cash and cash equivalents as at the beginning of the year 95 121 83
Net change in cash and cash equivalents 116 (23) 57
Net effect of currency translation on cash and cash equivalents 3 (3) (24)
Cash and cash equivalents included as part of assets held for sale 0 0 5
Cash and cash equivalents as at the end of the year $ 214 $ 95 $ 121