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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, 2019
Dec. 31, 2018
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year $ 518  
Other movements [Abstract]    
Balance as at the end of the year 583 $ 518
Fair value of plan assets [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year 518 631
Income (costs) included in profit or loss [Abstract]    
Current service costs 0 0
Interest income (expenses) 15 14
Past service cost 0 0
Effect of movements in exchange rates, net 17 (17)
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions 0 0
Other actuarial gains (losses) 46 (15)
Change with respect to translation differences ,net 9 (19)
Other movements [Abstract]    
Benefits paid (32) (38)
Conversion to defined contribution plans 0 (49)
Employer contribution 10 11
Balance as at the end of the year 583 518
Defined benefit obligation [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (860) (1,068)
Income (costs) included in profit or loss [Abstract]    
Current service costs (21) (24)
Interest income (expenses) (27) (26)
Past service cost 5 7
Effect of movements in exchange rates, net (31) 37
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions (121) 71
Other actuarial gains (losses) 0 0
Change with respect to translation differences ,net (4) 21
Other movements [Abstract]    
Benefits paid 55 73
Conversion to defined contribution plans 0 49
Employer contribution 0 0
Balance as at the end of the year (1,004) (860)
Defined benefit obligation, net [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (342) (437)
Income (costs) included in profit or loss [Abstract]    
Current service costs (21) (24)
Interest income (expenses) (12) (12)
Past service cost 5 7
Effect of movements in exchange rates, net (14) 20
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions (121) 71
Other actuarial gains (losses) 46 (15)
Change with respect to translation differences ,net 5 2
Other movements [Abstract]    
Benefits paid 23 35
Conversion to defined contribution plans 0 0
Employer contribution 10 11
Balance as at the end of the year $ (421) $ (342)