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Financial Risk (Details 16) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Liquid assets $ 1,048 $ 1,160
Securities at FVOCI    
Disclosure of financial assets [line items]    
Liquid assets 202  
Total (Member)    
Disclosure of financial assets [line items]    
Liquid assets 846  
United State of America    
Disclosure of financial assets [line items]    
Liquid assets 740 1,132
United State of America | Securities at FVOCI    
Disclosure of financial assets [line items]    
Liquid assets 90  
United State of America | Total (Member)    
Disclosure of financial assets [line items]    
Liquid assets 830  
Other countries O.E.C.D    
Disclosure of financial assets [line items]    
Liquid assets 100 4
Latin America    
Disclosure of financial assets [line items]    
Liquid assets 6 4
Other Countries    
Disclosure of financial assets [line items]    
Liquid assets   $ 20
Multinational    
Disclosure of financial assets [line items]    
Liquid assets 112  
Multinational | Securities at FVOCI    
Disclosure of financial assets [line items]    
Liquid assets $ 112