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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% |

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