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Introduction - Initial application of standards (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [2]
Jan. 01, 2019
Jan. 01, 2018
ASSETS          
Investments in joint ventures $ 2,867 $ 2,966     $ 2,989
Contract costs, net 4 0     4
Deferred tax assets 202 180     191
Other non-current assets 126 113     113
Trade receivables, net 343 386     339
Contract assets, net 37 0     28
LIABILITIES          
Contract liabilities 87 0 [1]     51
Provisions and other current liabilities 494 425 [1]     379
Current income tax liabilities 58 81 [1]      
Deferred tax liabilities 233 56 [1]     62
EQUITY          
Retained profits and loss for the year 2,525 3,035     3,045
Non-controlling interests 249 185 [1]     181
Revenue 4,074 4,076 [2] $ 4,043    
Cost of sales (1,146) (1,205) [2] (1,175)    
Operating expenses (1,674) (1,593) [2] (1,627)    
Share of profit in joint ventures in Guatemala and Honduras 154 140 [2],[3] 115 [3]    
Charge for taxes, net (116) (158) [2] $ (179)    
Finance lease liabilities 353 $ 365      
Increase (decrease) due to application of IFRS 15 [member]          
ASSETS          
Investments in joint ventures 28        
Contract costs, net 4        
Deferred tax assets 2        
Contract assets, net 37        
LIABILITIES          
Contract liabilities 87        
Provisions and other current liabilities (82)        
Current income tax liabilities 3        
Deferred tax liabilities 7        
EQUITY          
Retained profits and loss for the year 57        
Non-controlling interests 3        
Revenue (77)        
Cost of sales 48        
Operating expenses 40        
Share of profit in joint ventures in Guatemala and Honduras 2        
Charge for taxes, net (1)        
Calculated Under Guidance in Effect Prior to Adoption of IFRS 15 [Member]          
ASSETS          
Investments in joint ventures 2,839        
Contract costs, net 0        
Deferred tax assets 200        
Contract assets, net 0        
LIABILITIES          
Contract liabilities 0        
Provisions and other current liabilities 576        
Current income tax liabilities 55        
Deferred tax liabilities 226        
EQUITY          
Retained profits and loss for the year 2,468        
Non-controlling interests 246        
Revenue 4,151        
Cost of sales (1,194)        
Operating expenses (1,714)        
Share of profit in joint ventures in Guatemala and Honduras 152        
Charge for taxes, net $ (115)        
IFRS 15 [Member]          
ASSETS          
Investments in joint ventures         27
Contract costs, net         4
Deferred tax assets         0
Other non-current assets         0
Trade receivables, net         0
Contract assets, net         29
LIABILITIES          
Contract liabilities         51
Provisions and other current liabilities         (46)
Deferred tax liabilities         7
EQUITY          
Retained profits and loss for the year         48
Non-controlling interests         0
IFRS 9 [Member]          
ASSETS          
Investments in joint ventures         (4)
Contract costs, net         0
Deferred tax assets         10
Other non-current assets         (1)
Trade receivables, net         (47)
Contract assets, net         (1)
LIABILITIES          
Contract liabilities         0
Provisions and other current liabilities         0
Deferred tax liabilities         (1)
EQUITY          
Retained profits and loss for the year         (38)
Non-controlling interests         $ (5)
Minimum [Member]          
EQUITY          
Revenue From Contracts with Customers, Subscription Period 12 months        
Maximum [Member]          
EQUITY          
Revenue From Contracts with Customers, Subscription Period 36 months        
Forecast [Member] | Increase (Decrease) Due To Application of IFRS 16 [Member]          
EQUITY          
Finance lease liabilities       $ 600  
[1] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.
[2] Re-presented for discontinued operations (shown in note A.4.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.
[3] Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.