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Loans Payable - Banks (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Domestic Subsidiaries [Member]    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing amount $ 20  
Domestic Subsidiaries [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 2.00%  
Variable rate 0.14%  
Line of credit, maturity date Dec. 18, 2021  
Borrowing amount outstanding $ 0 $ 0
Foreign Subsidiaries [Member]    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing amount $ 31  
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate (EURIBOR) [Member]    
Line of Credit Facility [Line Items]    
Variable rate 0.546%  
Borrowing amount outstanding $ 0 $ 0
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate (EURIBOR) [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 0.50%  
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate (EURIBOR) [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 0.80%