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Provisions (Information) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Provisions [Line Items]  
Balance at the beginning of the year $ 266
Provisions recorded during the period 15 [1]
Provisions reversed during the period (23)
Payments during the period (12)
Translation differences (2)
Balance at the end of the year 244
Site restoration and equipmen dismantling [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 205
Provisions recorded during the period 11 [1]
Provisions reversed during the period (4)
Payments during the period (8)
Translation differences (2)
Balance at the end of the year 202
Legal claims [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 18
Provisions recorded during the period 1 [1]
Provisions reversed during the period (8)
Payments during the period (1)
Translation differences 0
Balance at the end of the year 10
Other [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 43
Provisions recorded during the period 3 [1]
Provisions reversed during the period (11)
Payments during the period (3)
Translation differences 0
Balance at the end of the year $ 32
[1] For additional information, see Note 19.