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Financial Instruments and Risk Management (Credit Risk - Aging of Trade Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Gross [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables $ 1,427 $ 893
Gross [Member] | Not past due [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables 1,313 788
Gross [Member] | Past due up to 3 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables 82 58
Gross [Member] | Past due 3 to 12 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables 23 7
Gross [Member] | Past due over 12 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables 9 40
Accumulated impairment [member]    
Disclosure of financial instruments [Line Items]    
Trade receivables (9) (10)
Accumulated impairment [member] | Not past due [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables (1) 0
Accumulated impairment [member] | Past due up to 3 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables 0 0
Accumulated impairment [member] | Past due 3 to 12 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables (2) (1)
Accumulated impairment [member] | Past due over 12 months [Member]    
Disclosure of financial instruments [Line Items]    
Trade receivables $ (6) $ (9)