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Financial Risk (Details 17) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Liquidity risk    
Demands liabilities and overnight $ 171 $ 86
% Demands liabilities and overnight of total deposits 5.44% 2.97%
Total liquid assets $ 1,048 $ 1,160
% Total assets of total liabilities 33.40% 40.15%
% Total liquid assets in the U.S. Federal Reserve 65.68% 97.37%
United State of America    
Liquidity risk    
Total liquid assets $ 740 $ 1,132