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Financial Instruments and Risk Management (Credit Risk - Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 1,472 $ 1,476
Cash and cash equivalents [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 121 83
Short term investments and deposits [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 92 90
Trade receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 990 932
Other receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 43 86
Investments at fair value through other comprehensive income [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 145 212
Other non-current assets [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 81 $ 73