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Debt (Interest Payable) (Details) - Surplus Notes
Mar. 31, 2021
A+  
Financing Receivable, Credit Quality Indicator [Line Items]  
Applicable Interest Rate 5.875%
A  
Financing Receivable, Credit Quality Indicator [Line Items]  
Applicable Interest Rate 6.375%
A-  
Financing Receivable, Credit Quality Indicator [Line Items]  
Applicable Interest Rate 6.875%
B++ (or lower)  
Financing Receivable, Credit Quality Indicator [Line Items]  
Applicable Interest Rate 7.375%