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RELATED PARTIES - Schedule of Total Amount of Transactions With Related Parties and Their Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of transactions between related parties        
Cost of services, equipment and accessories $ (38) $ (27) $ (71) $ (51)
Selling, general and administrative expenses (113) (92) (231) (183)
Finance costs (19) (18) (37) (39)
Other operating income 0 1 1 1
Finance income 4 4 8 11
Profit before tax 97 103 201 161
Ultimate and Immediate parent        
Disclosure of transactions between related parties        
Cost of services, equipment and accessories 0 0 0 0
Selling, general and administrative expenses 0 0 0 0
Finance costs (2) 0 (3) (1)
Depreciation charge of right-of-use asset 0 0 0 0
Other operating income 0 0 0 0
Other operating expenses 0 (11) 0 (20)
Finance income 0 3 0 8
Profit before tax (2) (8) (3) (13)
Entities under common control        
Disclosure of transactions between related parties        
Cost of services, equipment and accessories (4) (5) (8) (7)
Selling, general and administrative expenses 0 0 0 0
Finance costs (11) (20) (22) (30)
Depreciation charge of right-of-use asset (10) (17) (20) (25)
Other operating income 0 1 1 1
Other operating expenses (1) 0 (3) 0
Finance income 0 0 0 0
Profit before tax (26) (41) (52) (61)
Key Management Personnel        
Disclosure of transactions between related parties        
Cost of services, equipment and accessories 0 0 0 0
Selling, general and administrative expenses (1) (1) (2) (2)
Finance costs 0 0 0 0
Depreciation charge of right-of-use asset 0 0 0 0
Other operating income 0 0 0 0
Other operating expenses 0 0 0 0
Finance income 0 0 0 0
Profit before tax $ (1) $ (1) $ (2) $ (2)