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Consolidated Statements of Cash Flow - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
OPERATING ACTIVITIES        
Net income (loss) $ 223 $ (76) $ 363 $ 116
Adjustments for the following items:        
Depreciation 466 328 901 653
Finance costs 125 139 252 277
Impairment charges (notes 9B and 13) 12 59 15 61
Income tax expense (note 10) 41 116 208 317
Gain on sale of non-current assets (12) (2) (12) (48)
Currency translation losses (6) 75 16 90
Change in working capital (note 11) (86) (81) (330) (233)
Other operating activities (note 11) 42 (56) 14 (144)
Operating cash flows before interest and income taxes 805 502 1,427 1,089
Interest paid (137) (155) (165) (183)
Income taxes paid (234) (206) (308) (258)
Net cash provided by operating activities 434 141 954 648
Cash flows from (used in) investing activities [abstract]        
Capital expenditures (note 5) (379) (313) (753) (639)
Sales proceeds 15 5 18 52
Investment purchases (4) (38) (7) (39)
Cash acquired in merger 0 0 751 0
Other investing activities (note 11) 17 (1) 62 (5)
Net cash provided by (used in) investing activities (351) (347) 71 (631)
FINANCING ACTIVITIES        
Lease repayments (6) 0 (18) 0
Debt repayments 0 (8) (16) (31)
Dividends (61) (32) (394) (63)
Funding from non-controlling interests 8 4 14 12
Disbursements to non-controlling interests (23) (56) (28) (82)
Net cash used in financing activities (82) (92) (442) (164)
Effect of exchange rate changes on cash and equivalents (1) (1) (1) (2)
Net increase (decrease) in cash and equivalents 0 (299) 582 (149)
Cash and equivalents at the beginning of period 2,153 2,384 1,571 2,234
Cash and equivalents at the end of period $ 2,153 $ 2,085 $ 2,153 $ 2,085