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INVESTMENTS - Narrative (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
loan
extension
issue
Dec. 31, 2022
USD ($)
issue
Dec. 31, 2021
USD ($)
Net Investment Income [Line Items]      
Number of positions in unrealized loss position | issue 4,402 5,209  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.80%    
Amortized cost of fixed maturities available-for-sale $ 74,033,000,000 $ 72,991,000,000  
12 months or longer, gross unrealized losses 7,261,000,000 5,295,000,000  
Loaned securities $ 113,000,000    
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%    
Cash collateral $ 116,000,000    
Allowance for credit losses $ 279,000,000 129,000,000 $ 62,000,000
Number of loans | loan 4    
Amortized cost $ 234,000,000    
Percentage of total commercial mortgage loans representing amortized cost 1.50%    
Number of troubled debt restructuring extensions | extension 2    
Separate account equity investment carrying value $ 49,000,000 39,000,000  
Interest credited to policyholders account balances participating group annuity contracts 1,000,000 1,000,000 2,000,000
Recurring      
Net Investment Income [Line Items]      
Trading securities, at fair value $ 1,057,000,000 677,000,000  
Minimum      
Net Investment Income [Line Items]      
Debt instrument, term 17 months    
Maximum      
Net Investment Income [Line Items]      
Debt instrument, term 4 years    
Commercial, Agricultural And Residential Mortgage Loan      
Net Investment Income [Line Items]      
Accrued investment income receivable $ 82,000,000 71,000,000  
Accrued interest written off $ 0 0  
Individually Assessed Mortgage Loans      
Net Investment Income [Line Items]      
Number of mortgage loans, foreclosure probable | loan 1    
Mortgage loans foreclosure probable $ 108,000,000    
Allowance for credit losses 54,000,000    
Mortgage Loans      
Net Investment Income [Line Items]      
Non-accruing loans, amortized cost 127,000,000 16,000,000  
Fixed maturities      
Net Investment Income [Line Items]      
Accrued investment income receivable 626,000,000 591,000,000  
Accrued interest written off 0 0 $ 0
Amortized cost of fixed maturities available-for-sale 74,000,000,000 73,000,000,000  
Fixed maturities | Non-Investment Grade      
Net Investment Income [Line Items]      
Available-for-sale securities, amortized cost basis other than investment grade $ 2,600,000,000 $ 2,900,000,000  
Percentage of available for sale securities 3.50% 4.00%  
Unrealized loss on available for sale securities $ 101,000,000 $ 208,000,000  
Public Corporate      
Net Investment Income [Line Items]      
Exposure in single issuer of total investments $ 360,000,000 $ 327,000,000  
Debt securities exposure in single issuer of total investments, percentage 8.20% 10.40%  
Amortized cost of fixed maturities available-for-sale $ 49,786,000,000 $ 50,712,000,000  
12 months or longer, gross unrealized losses $ 5,231,000,000 $ 4,536,000,000