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SIGNIFICANT TRANSACTIONS - Joint Ventures (Details)
€ in Millions, $ in Millions
12 Months Ended
Nov. 05, 2016
USD ($)
Aug. 06, 2015
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 05, 2016
EUR (€)
Nov. 05, 2016
USD ($)
Effect of the disposal of Italy              
Gain on disposal of discontinued operations, net of tax       $ 1,788      
Financial information related to discontinued operations              
Profit after tax for the period from discontinued operations       920 $ 262    
Italy Disposal              
Key assumptions used in the discounted cash flow model              
Discount rate (functional currency) 6.90%            
Average annual revenue growth rate during forecast period (functional currency) (2.30%)            
Terminal growth rate 0.50%            
Average operating (EBITDA) margin during forecast period 35.70%            
Average capital expenditure as a percentage of revenue 21.00%            
Effect of the disposal of Italy              
Fair value of investment in joint venture             $ 2,113
Cash consideration receivable             28
Total Disposal Consideration $ 2,141            
Derecognition of assets classified as held for sale (15,974)            
Derecognition of liabilities classified as held for sale 15,414            
Release cumulative other comprehensive income related to Italy 207            
Gain on disposal of discontinued operations, net of tax $ 1,788            
Financial information related to discontinued operations              
Total operating revenues       4,135 4,913    
Total operating expenses       (2,556) (3,765)    
Operating profit       1,579 1,148    
Other (expenses) / income       (217) (722)    
Profit / (loss) before tax       1,362 426    
Income tax (expense) / benefit       (442) (164)    
Profit after tax for the period from discontinued operations       $ 920 $ 262    
HET              
Joint Venture in Italy              
Percentage of interest in subsidiary   100.00%          
Italy Joint Venture              
Joint Venture in Italy              
Ownership interest in joint venture (in percentage) 50.00%   50.00% 50.00%      
Effect of the disposal of Italy              
Fair value of investment in joint venture           € 1,897 $ 2,113