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Financial Risk (Details 18) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financial Risk    
Loan portfolio and investment portfolio less than/equal to 1 year according to its original term $ 3,114 $ 3,485
Average term (days) 195 days 189 days
Loan portfolio at amortized cost and investment portfolio greater than/equal to 1 year according to its original terms $ 2,193 $ 2,497
Average term (days) 1382 days 1185 days