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Equity (Share-based Payments to Employees, Non-marketable Options, Movement) (Details) - Non Marketable Options [Member] - Share
Share in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Balance as at start of year 15 12
Granted during the year   12
Forfeited during the year   (2)
Exercised during the year (1) (7)
Balance as at end of year 14 15