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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, 2017
Dec. 31, 2016
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year $ 552  
Other movements [Abstract]    
Balance as at the end of the year 631 $ 552
Fair value of plan assets [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year 552 669
Income (costs) included in profit or loss [Abstract]    
Current service cost 0 0
Interest income (costs) 17 13
Past service cost 0 (70)
Effect of movements in exchange rates, net 23 3
Included in other comprehensive income [Abstract]    
Actuarial losses deriving from changes in financial assumptions 0 0
Other actuarial gains 25 34
Change in respect to translation differences ,net 36 (56)
Other movements [Abstract]    
Benefits paid (36) (54)
Transerred to assets held for sale 0 0
Employer contribution 13 12
Employee contribution 1 1
Balance as at the end of the year 631 552
Defined benefit obligation [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (934) (1,025)
Income (costs) included in profit or loss [Abstract]    
Current service cost (24) (11)
Interest income (costs) (29) (33)
Past service cost 0 84
Effect of movements in exchange rates, net (39) (5)
Included in other comprehensive income [Abstract]    
Actuarial losses deriving from changes in financial assumptions (42) (82)
Other actuarial gains 0 0
Change in respect to translation differences ,net (65) 70
Other movements [Abstract]    
Benefits paid 64 68
Transerred to assets held for sale 1 0
Employer contribution 0 0
Employee contribution 0 0
Balance as at the end of the year (1,068) (934)
Defined benefit obligation, net [Member]    
Movement in net defined benefit assets (liabilities) [Line Items]    
Balance as at the begining of the year (382) (356)
Income (costs) included in profit or loss [Abstract]    
Current service cost (24) (11)
Interest income (costs) (12) (20)
Past service cost 0 14
Effect of movements in exchange rates, net (16) (2)
Included in other comprehensive income [Abstract]    
Actuarial losses deriving from changes in financial assumptions (42) (82)
Other actuarial gains 25 34
Change in respect to translation differences ,net (29) 15
Other movements [Abstract]    
Benefits paid 28 14
Transerred to assets held for sale 1 0
Employer contribution 13 12
Employee contribution 1 0
Balance as at the end of the year $ (437) $ (382)