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Provisions (Information) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Provisions [Line Items]  
Balance at the beginning of the year $ 271
Provisions recorded during the period 27 [1]
Provisions reversed during the period (9)
Payments during the period (17)
Translation differences (6)
Balance at the end of the year 266
Restoration's site and equipment's dismantling [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 194
Provisions recorded during the period 25 [1]
Provisions reversed during the period (3)
Payments during the period (6)
Translation differences (5)
Balance at the end of the year 205
Legal claims [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 28
Provisions recorded during the period 2 [1]
Provisions reversed during the period 0
Payments during the period (11)
Translation differences (1)
Balance at the end of the year 18
Other [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 49
Provisions recorded during the period 0 [1]
Provisions reversed during the period (6)
Payments during the period 0
Translation differences 0
Balance at the end of the year $ 43
[1] For additional information, see Note 20.