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Investments (excluding Consolidated Investment Entities) - Past due commercial mortgage loans (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]    
Loans on non-accrual status $ 45,000,000 $ 16,000,000
Nonaccrual, interest income $ 0 0
Private placement debt    
Financing Receivable, Past Due [Line Items]    
Threshold period past due, nonaccrual 90 days  
Private placement debt | Current    
Financing Receivable, Past Due [Line Items]    
Commercial mortgage loans $ 4,956,000,000 5,202,000,000
Private placement debt | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Commercial mortgage loans 26,000,000 0
Private placement debt | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Commercial mortgage loans 0 0
Private placement debt | Greater than 90 days past due    
Financing Receivable, Past Due [Line Items]    
Commercial mortgage loans 19,000,000 16,000,000
Private placement debt | Total    
Financing Receivable, Past Due [Line Items]    
Commercial mortgage loans $ 5,001,000,000 $ 5,218,000,000