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Financial assets and liabilities - Carrying value and fair value of the related party and other borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Amount drawn $ 3,933 $ 3,762
Deferred debt issuance costs and premium (31) (28)
Net borrowings 3,902 3,734
Fair Value 53 84
Carrying value    
Disclosure of detailed information about borrowings [line items]    
Amount drawn 3,559 3,354
Deferred debt issuance costs and premium (31) (28)
Net borrowings 3,528 3,326
Carrying value | Loan Notes    
Disclosure of detailed information about borrowings [line items]    
Amount drawn 3,517 3,300
Deferred debt issuance costs and premium (28) (23)
Net borrowings 3,489 3,277
Carrying value | Other borrowings    
Disclosure of detailed information about borrowings [line items]    
Amount drawn 42 54
Deferred debt issuance costs and premium (3) (5)
Net borrowings 39 49
Fair value    
Disclosure of detailed information about borrowings [line items]    
Fair Value 3,215 2,939
Fair value | Loan Notes    
Disclosure of detailed information about borrowings [line items]    
Fair Value 3,173 2,885
Fair value | Other borrowings    
Disclosure of detailed information about borrowings [line items]    
Fair Value $ 42 $ 54