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Related and Interested Parties (Benefits to Key Management Personnel including Directors) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]    
Short-term benefits $ 8 $ 8
Post-employment benefits 1 1
Share-based payments 4 2
Total 13 11
To interested parties employed by the Company 4 3
To interested parties not employed by the Company $ 1 $ 2