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Financial Instruments and Risk Management (Credit Risk - Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 2,186 $ 1,466
Cash and cash equivalents [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 473 214
Short term investments and deposits [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 91 100
Trade receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 1,418 883
Other receivables [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 45 122
Derivatives [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount 145 139
Other non-current assets [Member]    
Maximum Exposure to credit risk Financial assets [Line Items]    
Carrying amount $ 14 $ 8