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Provisions (Information) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Provisions [Line Items]  
Balance at the beginning of the year $ 244
Provisions recorded during the period 84
Provisions reversed during the period (4)
Payments during the period (15)
Translation differences 12
Balance at the end of the year 321
Site restoration and equipmen dismantling [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 202
Provisions recorded during the period 79
Provisions reversed during the period (1)
Payments during the period (12)
Translation differences 11
Balance at the end of the year 279
Legal claims [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 10
Provisions recorded during the period 0
Provisions reversed during the period 0
Payments during the period (1)
Translation differences 1
Balance at the end of the year 10
Other [Member]  
Provisions [Line Items]  
Balance at the beginning of the year 32
Provisions recorded during the period 5
Provisions reversed during the period (3)
Payments during the period (2)
Translation differences 0
Balance at the end of the year $ 32