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Consolidated Statements of Cash Flow - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
OPERATING ACTIVITIES        
Net (loss) income $ (76) $ 1,137 $ 116 $ 2,026
Adjustments for the following items:        
Depreciation 328 409 653 823
Finance costs 139 178 277 331
Impairment (reversals) charges (note 13) 59 (5) 61 (1,130)
Income tax expense (note 10) 116 274 317 866
Gains on sale of non-current assets/investments (2) (880) (48) (877)
Currency translation losses 75 32 90 35
Change in working capital (note 11) (194) (182) (370) (378)
Other operating activities (note 11) 57 (21) (7) (105)
Operating cash flows before interest and income taxes 502 942 1,089 1,591
Interest paid (155) (188) (183) (223)
Income taxes paid (206) (306) (258) (425)
Net cash provided by operating activities 141 448 648 943
INVESTING ACTIVITIES        
Capital expenditures (note 5) (313) (405) (639) (739)
Sales proceeds 5 5 7 12
Investment purchases (38) 0 (39) 0
Divestitures (note 4) 0 960 0 960
Sale of mineral royalty 0 0 45 0
Funding of equity method investments (1) (4) (5) (8)
Net cash provided by (used in) investing activities (347) 556 (631) 225
FINANCING ACTIVITIES        
Debt, Repayments (8) (305) (31) (485)
Dividends (32) (32) (63) (63)
Funding from non-controlling interests 4 8 12 8
Disbursements to non-controlling interests (56) 0 (82) (67)
Debt extinguishment costs 0 (26) 0 (26)
Net cash used in financing activities (92) (355) (164) (633)
Effect of exchange rate changes on cash and equivalents (1) 0 (2) 2
Net increase (decrease) in cash and equivalents (299) 649 (149) 537
Cash and equivalents at the beginning of period 2,384 2,277 2,234 2,389
Cash and equivalents at the end of period $ 2,085 $ 2,926 $ 2,085 $ 2,926