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Related and Interested Parties (Benefits to Key Management Personnel including Directors) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]    
Short-term benefits $ 11 $ 8
Post-employment benefits 1 1
Share-based payments 4 4
Total 16 13
To interested parties employed by the Company 5 4
To interested parties not employed by the Company $ 1 $ 1