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Consolidated Statements of Cash Flow - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
OPERATING ACTIVITIES        
Net income $ 622 $ 223 $ 1,285 $ 363
Adjustments for the following items:        
Depreciation 566 466 1,090 901
Finance costs, net 86 125 197 252
Impairment (reversals) charges (notes 9B and 13) 23 12 (313) 15
Income tax expense (note 10) 258 41 644 208
Loss (gain) on sale of non-current assets 8 (12) (52) (12)
Loss (gain) on currency translation 2 (6) 18 16
Change in working capital (note 11) (9) (82) (341) (330)
Other operating activities (note 11) (35) 38 18 14
Operating cash flows before interest and income taxes 1,521 805 2,546 1,427
Interest paid (130) (137) (154) (165)
Income taxes paid (360) (234) (472) (308)
Net cash provided by operating activities 1,031 434 1,920 954
INVESTING ACTIVITIES        
Capital expenditures (note 5) (509) (379) (960) (753)
Sales proceeds 9 15 16 18
Purchase of investments other than investments accounted for using equity method   (4)   (7)
Proceeds from sales of investments other than investments accounted for using equity method 206   206  
Divestitures (note 4) 0 0 256 0
Cash acquired in merger 0 0 0 751
Other investing activities (note 11) 30 17 55 62
Net cash provided by (used in) investing activities (264) (351) (427) 71
FINANCING ACTIVITIES        
Payments of lease liabilities, classified as financing activities 7 6 12 18
Debt repayments 0 0 (351) (16)
Dividends (124) (61) (246) (394)
Funding from non-controlling interests 0 8 1 14
Disbursements to non-controlling interests (217) (23) (434) (28)
Other inflows (outflows) of cash, classified as financing activities 0 0 (15) 0
Net cash used in financing activities (348) (82) (1,057) (442)
Effect of exchange rate changes on cash and equivalents (3) (1) (7) (1)
Net increase in cash and equivalents 416 0 429 582
Cash and equivalents at the beginning of period 3,327 2,153 3,314 1,571
Cash and equivalents at the end of period $ 3,743 $ 2,153 $ 3,743 $ 2,153