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Financial Instruments and Risk Management (Credit Risk - Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 1,148 $ 1,327
Cash and cash equivalents [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 95 121
Short term investments and deposits [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 96 92
Trade receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 778 990
Other receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 116 43
Other non-current assets [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 63 $ 81