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SIGNIFICANT ACCOUNTING POLICIES THAT RELATE TO THE CONSOLIDATED FINANCIAL STATEMENTS AS A WHOLE (Details) - USD ($)
$ in Millions
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Non-current assets          
Investments in joint ventures and associates   $ 1,921 $ 2,179 $ 201 $ 265
Deferred tax assets   272 343    
Other assets   199 118    
Current assets          
Trade and other receivables   745 685    
Other assets   394 439    
Equity          
Equity attributable to equity owners of the parent   4,352 5,960    
Non-controlling interests   (425) 83    
Liabilities          
Other liabilities (current)   1,346 1,236    
Deferred tax liabilities   $ 376 $ 331    
Impact of Adoption of IFRS 9 and IFRS 15 | Opening balance sheet          
Non-current assets          
Investments in joint ventures and associates $ 1,921        
Deferred tax assets 272        
Available for sale 18        
Other assets 199        
Current assets          
Trade and other receivables 745        
Available for sale 53        
Other assets 394        
Equity          
Equity attributable to equity owners of the parent 4,352        
Non-controlling interests (425)        
Liabilities          
Other liabilities (current) 1,346        
Deferred tax liabilities 376        
Proforma Adjustment | Impact of Adoption of IFRS 9 and IFRS 15          
Non-current assets          
Investments in joint ventures and associates 1,926        
Deferred tax assets 264        
Fair value through other comprehensive income 18        
Other assets 292        
Current assets          
Trade and other receivables 727        
Fair value through other comprehensive income 53        
Other assets 386        
Equity          
Equity attributable to equity owners of the parent 4,394        
Non-controlling interests (416)        
Liabilities          
Other liabilities (current) 1,345        
Deferred tax liabilities 390        
Proforma Adjustment | Impact of Adoption of IFRS 9 and IFRS 15 | Impact of IFRS 9 - Classification and measurement          
Non-current assets          
Investments in joint ventures and associates (25)        
Available for sale (18)        
Fair value through other comprehensive income 18        
Current assets          
Available for sale (53)        
Fair value through other comprehensive income 53        
Equity          
Equity attributable to equity owners of the parent (25)        
Proforma Adjustment | Impact of Adoption of IFRS 9 and IFRS 15 | Impact of IFRS 9 - Impairment          
Non-current assets          
Investments in joint ventures and associates (10)        
Deferred tax assets 4        
Current assets          
Trade and other receivables (18)        
Equity          
Equity attributable to equity owners of the parent (18)        
Non-controlling interests (5)        
Liabilities          
Deferred tax liabilities (1)        
Proforma Adjustment | Impact of Adoption of IFRS 9 and IFRS 15 | Impact of IFRS 15 - Revenue and contract costs          
Non-current assets          
Investments in joint ventures and associates 40        
Deferred tax assets (12)        
Other assets 93        
Current assets          
Other assets (8)        
Equity          
Equity attributable to equity owners of the parent 85        
Non-controlling interests 14        
Liabilities          
Other liabilities (current) (1)        
Deferred tax liabilities $ 15