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IMPAIRMENT OF ASSETS - Impairment losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal) $ 3 $ (6) $ (107)
Ukraine      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal) 3 1 36
Other      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)   (7) 6
Bangladesh      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (100)
Kyrgyzstan      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (49)
Property and equipment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal) 3 (6) (19)
Property and equipment | Ukraine      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal) $ 3 1 35
Property and equipment | Other      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)   $ (7) 7
Property and equipment | Bangladesh      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (32)
Property and equipment | Kyrgyzstan      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (29)
Intangible assets      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (77)
Intangible assets | Ukraine      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     1
Intangible assets | Other      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (1)
Intangible assets | Bangladesh      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (68)
Intangible assets | Kyrgyzstan      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (9)
Other      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     (11)
Other | Ukraine      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     0
Other | Other      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     0
Other | Bangladesh      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     0
Other | Kyrgyzstan      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss / (reversal)     $ (11)