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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, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Balance as at start of year 12 27
Granted during the year 12  
Expired during the year   1
Forfeited during the year (2)  
Exercised during the year (7) (16)
Balance as at end of year 15 12