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Details of Income Statement Items (Other Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other income and expenses [Abstract]      
Capital gain from divestitures of subsidiaries and loss of control $ 54 $ 0 $ 215
Insurance compensation 30 30 20
Retroactive electricity charges 6 16 0
Past service cost 0 14 0
Other 19 11 15
Other income recorded in the income statements 109 71 250
Write-down and impairment of assets 32 489 90
Provision for legal claims 25 8 8
Provision for early retirement and dismissal of employees 20 39 48
Environment related provision 7 0 0
Provision in respect of prior periods resulting from an arbitration decision 6 13 10
Provision for historical waste removal 0 51 20
Retroactive electricity charges 0 0 20
Other 0 18 15
Other expenses recorded in the income statements $ 90 $ 618 $ 211