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Employee Benefits (Movement in Net Defined Benefit Assets Liabilities and in their Components) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year $ 629  
Other movements [Abstract]    
Balance as at the end of the year 648 $ 629
Fair value of plan assets [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year 629 583
Income (costs) included in profit or loss [Abstract]    
Current service costs 0 0
Interest income (expenses) 6 5
Past service cost 0 0
Effect of movements in exchange rates, net 8 16
Included in other comprehensive income [Abstract]    
Actuarial profits (losses) deriving from changes in financial assumptions 0 0
Other actuarial gains 17 9
Change with respect to translation differences ,net (10) 18
Other movements [Abstract]    
Benefits received (paid) (6) (6)
Employer contribution 4 4
Balance as at the end of the year 648 629
Defined benefit obligation [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (1,075) (1,004)
Income (costs) included in profit or loss [Abstract]    
Current service costs (24) (22)
Interest income (expenses) (14) (14)
Past service cost 12 11
Effect of movements in exchange rates, net (16) (34)
Included in other comprehensive income [Abstract]    
Actuarial profits (losses) deriving from changes in financial assumptions 68 (24)
Other actuarial gains (0)  
Change with respect to translation differences ,net 21 (32)
Other movements [Abstract]    
Benefits received (paid) 35 44
Balance as at the end of the year (993) (1,075)
Defined benefit obligation, net [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (446) (421)
Income (costs) included in profit or loss [Abstract]    
Current service costs (24) (22)
Interest income (expenses) (8) (9)
Past service cost 12 11
Effect of movements in exchange rates, net (8) (18)
Included in other comprehensive income [Abstract]    
Actuarial profits (losses) deriving from changes in financial assumptions 68 (24)
Other actuarial gains 17 9
Change with respect to translation differences ,net 11 (14)
Other movements [Abstract]    
Benefits received (paid) 29 38
Employer contribution 4 4
Balance as at the end of the year $ (345) $ (446)