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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, 2018
Dec. 31, 2017
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year $ 631  
Other movements [Abstract]    
Balance as at the end of the year 518 $ 631
Fair value of plan assets [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year 631 552
Income (costs) included in profit or loss [Abstract]    
Current service costs 0 0
Interest income (costs) 14 17
Past service cost 0 0
Effect of movements in exchange rates, net (17) 23
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions 0 0
Other actuarial gains (losses) (15) 25
Change in respect to translation differences ,net (19) 36
Other movements [Abstract]    
Benefits paid (38) (36)
Conversion to defined contribution plans (49) 0
Transerred to assets held for sale 0 0
Employer contribution 11 14
Balance as at the end of the year 518 631
Defined benefit obligation [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (1,068) (934)
Income (costs) included in profit or loss [Abstract]    
Current service costs (24) (24)
Interest income (costs) (26) (29)
Past service cost 7 0
Effect of movements in exchange rates, net 37 (39)
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions 71 (42)
Other actuarial gains (losses) 0 0
Change in respect to translation differences ,net 21 (65)
Other movements [Abstract]    
Benefits paid 73 64
Conversion to defined contribution plans 49 0
Transerred to assets held for sale 0 1
Employer contribution 0 0
Balance as at the end of the year (860) (1,068)
Defined benefit obligation, net [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (437) (382)
Income (costs) included in profit or loss [Abstract]    
Current service costs (24) (24)
Interest income (costs) (12) (12)
Past service cost 7 0
Effect of movements in exchange rates, net 20 (16)
Included in other comprehensive income [Abstract]    
Actuarial gains (losses) deriving from changes in financial assumptions 71 (42)
Other actuarial gains (losses) (15) 25
Change in respect to translation differences ,net 2 (29)
Other movements [Abstract]    
Benefits paid 35 28
Conversion to defined contribution plans 0 0
Transerred to assets held for sale 0 1
Employer contribution 11 14
Balance as at the end of the year $ (342) $ (437)