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SIGNIFICANT TRANSACTIONS - Sale of operations in Zimbabwe (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 21, 2017
Feb. 20, 2017
Nov. 30, 2016
Nov. 18, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Telecel International Limited              
Significant Transactions              
Amount per agreement       $ 40      
Gain on sale     $ 21        
Global Telecom Holding S.A.E              
Significant Transactions              
Percentage of interest in subsidiary 57.69% 51.92%     57.70% 51.90%  
ZARNet Private Limited | Telecel International Limited              
Significant Transactions              
Purchase price cash consideration       21      
Cash consideration received           $ 11 $ 10
ZARNet Private Limited | Global Telecom Netherlands B.V.              
Significant Transactions              
Vendor Note payable       $ 19      
Agreement term       3 years      
Telecel Zimbabwe (Pvt) Ltd | Telecel International Limited              
Significant Transactions              
Percentage of interest in subsidiary       60.00%