v3.26.1
INVESTMENTS, DEBT AND DERIVATIVES - Investments and derivatives narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]      
Financial assets at amortised cost $ 595 $ 392  
Financial assets measured at fair value through other comprehensive income 38 30  
Fair value re-measurement of financial instruments 8 (11) $ (16)
Financial liabilities at amortised cost 5,118 4,694  
Borrowing, of which other borrowings      
Disclosure of financial assets [line items]      
Financial liabilities at amortised cost 94 83  
Borrowing, of which other borrowings | Long-term capex accounts payable      
Disclosure of financial assets [line items]      
Financial liabilities at amortised cost 94 83  
Security deposits and cash collateral      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 159 117  
Security deposits and cash collateral | Restricted bank deposits      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 27 32  
Security deposits and cash collateral | Restricted cash      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 118 63  
Deferred consideration from sale of subsidiary      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 250 101  
Deferred consideration from sale of subsidiary | Sale and leaseback of Deodar      
Disclosure of financial assets [line items]      
Financial assets at amortised cost   250  
Deferred consideration from sale of subsidiary | TNS Plus LLP      
Disclosure of financial assets [line items]      
Financial assets at amortised cost   101  
Other investments      
Disclosure of financial assets [line items]      
Financial assets measured at fair value through other comprehensive income 38 30  
Other investments | Pakistan      
Disclosure of financial assets [line items]      
Financial assets measured at fair value through other comprehensive income 4 4  
Other investments | Bangladesh      
Disclosure of financial assets [line items]      
Financial assets measured at fair value through other comprehensive income 34 26  
Other investments      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 184 172  
Other investments | Loan to related party      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 27 69  
Other investments | Sovereign bonds | Pakistan      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 33 27  
Other investments | Sovereign bonds | Ukraine      
Disclosure of financial assets [line items]      
Financial assets at amortised cost 0 30  
Other investments | Short term loan      
Disclosure of financial assets [line items]      
Financial assets at amortised cost $ 94 $ 42