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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Capital stock
Retained earnings (deficit)
Accumulated other comprehensive income (loss)
 [1]
Other
 [2]
Total equity attributable to shareholders
Non-controlling interests
Beginning balance (shares) at Dec. 31, 2016   1,165,574,000          
Beginning balance at Dec. 31, 2016 $ 10,313 $ 20,877 $ (13,074) $ (189) $ 321 $ 7,935 $ 2,378
Net income 2,026   1,763     1,763 263
Total other comprehensive income 7   0 7   7  
Total comprehensive (loss) income 2,033   1,763 7   1,770 263
Transactions with owners              
Dividends (63)   (63)     (63)  
Funding from non-controlling interests 8           8
Decrease in non-controlling interest (note 4A) (493)           (493)
Other decrease in non-controlling interests (113)           (113)
Dividend reinvestment plan   $ 8 (8)        
Dividend reinvestment plan (shares)   429,000          
Total transactions with owners (shares)   429,000          
Total transactions with owners (661) $ 8 (71)     (63) (598)
Ending balance (shares) at Jun. 30, 2017   1,166,003,000          
Ending balance at Jun. 30, 2017 11,685 $ 20,885 (11,382) (182) 321 9,642 2,043
Beginning balance (shares) at Dec. 31, 2017   1,166,577,000          
Beginning balance at Dec. 31, 2017 11,067 $ 20,893 (11,759) (169) 321 9,286 1,781
Beginning balance (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Dec. 31, 2017 64         64  
Beginning balance (Increase (decrease) due to application of IFRS 15 [member]) at Dec. 31, 2017     64        
Beginning balance (Currently stated [member]) at Dec. 31, 2017 11,131   (11,695)     9,350  
Net income 116   64     64 52
Total other comprehensive income 5   0 5   5  
Total comprehensive (loss) income 121   64 5   69 52
Transactions with owners              
Dividends (63)   (63)     (63)  
Issued on exercise of stock options   11,000          
Funding from non-controlling interests 12           12
Other decrease in non-controlling interests (95)           (95)
Dividend reinvestment plan   $ 7 (7)        
Dividend reinvestment plan (shares)   571,284          
Total transactions with owners (shares)   582,000          
Total transactions with owners (146) $ 7 (70)     (63) (83)
Ending balance (shares) at Jun. 30, 2018   1,167,159,000          
Ending balance at Jun. 30, 2018 $ 11,106 $ 20,900 $ (11,701) $ (164) $ 321 9,356 $ 1,750
Ending balance (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Jun. 30, 2018           $ 64  
[1] 1 Includes cumulative translation losses at June 30, 2018: $72 million (June 30, 2017: $67 million)
[2] 2 Includes additional paid-in capital as at June 30, 2018: $283 million (December 31, 2017: $283 million; June 30, 2017: $283 million) and convertible borrowings - equity component as at June 30, 2018: $38 million (December 31, 2017: $38 million; June 30, 2017: $38 million).The accompanying notes are an integral part of these condensed interim consolidated financial statements.