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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans and Leases Receivable, Loan to Value, Benchmark Ratio 100.00%  
Loans and Leases Receivable, Debt Service Coverage, Benchmark Ratio 100.00%  
Private Placement    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-modification carrying value | $ $ 26  
Post-modification carrying value | $ $ 10  
Private Placement    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Troubled debt restructuring, number of contracts   3
Commercial Mortgage Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Troubled debt restructuring, number of contracts   0
Commercial Portfolio Segment    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Troubled debt restructuring, number of contracts 0