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Financing Agreements - Credit Facilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]      
Capacity $ 512    
Utilization 12    
Unused Commitment 500    
Unsecured and Committed | Voya Financial, Inc.      
Line of Credit Facility [Line Items]      
Capacity 500    
Utilization 0    
Unused Commitment 500    
Unsecured and Committed | Voya Financial, Inc. Three      
Line of Credit Facility [Line Items]      
Capacity 12 $ 12 $ 200
Utilization 12    
Unused Commitment $ 0