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RELATED PARTIES - Transactions with related parties and balances of accounts (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of transactions between related parties          
Revenue $ 5 $ 35 $ 11 $ 55  
Services   37 5 53  
Other assets due from related parties 3   3   $ 3
Total accounts receivables and other assets 8   8   26
Accounts payable 2   2   5
Telenor          
Disclosure of transactions between related parties          
Revenue   28   39  
Services   26   36  
Joint ventures and associates          
Disclosure of transactions between related parties          
Revenue 5 7 11 16  
Services   $ 11 5 $ 17  
Accounts receivable 5   5   23
Accounts payable $ 2   $ 2   $ 5