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Other assets and liabilities F.1. Trade receivables (Details) - Trade receivables, net - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 527 $ 390
Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 350 252
30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 90 64
Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 87 74
Telecom operators    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 24 26
Telecom operators | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12 8
Telecom operators | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 6 8
Telecom operators | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 7 10
Own customers    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 430 303
Own customers | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 294 214
Own customers | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 77 47
Own customers | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 60 42
Others    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 72 61
Others | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 44 29
Others | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 7 9
Others | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 21 22
Gross trade receivables    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,027 800
Less: provisions for expected credit losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ (500) $ (411)