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Provisions (Information) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Provisions [Line Items]  
Balance at the beginning of the year $ 268
Provisions recorded during the period 40 [1]
Provisions reversed during the period (5)
Payments during the period (44)
Translation differences 12
Balance at the end of the year 271
Restoration's site and equipment's dismantling [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 172
Provisions recorded during the period 17 [1]
Provisions reversed during the period 0
Payments during the period (6)
Translation differences 11
Balance at the end of the year 194
Legal claims [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 17
Provisions recorded during the period 19 [1]
Provisions reversed during the period (2)
Payments during the period (7)
Translation differences 1
Balance at the end of the year 28
Other [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 79
Provisions recorded during the period 4 [1]
Provisions reversed during the period (3)
Payments during the period (31)
Translation differences 0
Balance at the end of the year $ 49
[1] For additional information, see Note 21 regarding concessions and contingent liabilities.