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Investments in Subsidiaries and Investee Companies (Movement During the Year in Investments in Equity-Accounted Investees) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Investments in subsidiaries and investee companies [Line Items]  
Balance as at Start of Period $ 153
Balance as at End of Period 29
Associated companies [Member]  
Investments in subsidiaries and investee companies [Line Items]  
Balance as at Start of Period 153
Dividends received (3)
Divestiture of equity accounted investees (122) [1]
Translation differences 1
Balance as at End of Period $ 29
[1] see note 11.