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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
loan
issue
Dec. 31, 2024
USD ($)
loan
issue
note
Dec. 31, 2023
USD ($)
extension
loan
issue
Dec. 31, 2022
USD ($)
Net Investment Income [Line Items]        
Number of positions in unrealized loss position | issue 4,307 4,307 4,402  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.80% 0.80%    
Amortized cost of fixed maturities available-for-sale $ 84,717,000,000 $ 84,717,000,000 $ 74,033,000,000  
12 months or longer, gross unrealized losses 8,188,000,000 8,188,000,000 7,261,000,000  
Loaned securities 134,000,000 $ 134,000,000 113,000,000  
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral   102.00%    
Cash collateral 137,000,000 $ 137,000,000 116,000,000  
Allowance for credit losses 278,000,000 278,000,000 279,000,000 $ 129,000,000
Non-accruing Loans $ 93,000,000 $ 93,000,000 $ 253,000,000  
Number of loans | loan 0 1 4  
Number of loans split into notes | note   2    
Number of notes with original loan terms | note   1    
Amortized cost   $ 65,000,000 $ 228,000,000  
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 $ 64,000,000 64,000,000 $ 49,000,000  
Interest credited to policyholders account balances participating group annuity contracts   2,000,000 1,000,000 1,000,000
Recurring        
Net Investment Income [Line Items]        
Trading securities, at fair value 1,095,000,000 1,095,000,000 $ 1,057,000,000  
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 $ 96,000,000 96,000,000 $ 82,000,000  
Accrued interest written off   $ 0 0  
Individually Assessed Mortgage Loans        
Net Investment Income [Line Items]        
Number of foreclosed mortgage loans | loan 1 1    
Amortized cost of foreclosed mortgage loans $ 108,000,000 $ 108,000,000    
Allowance for credit losses 54,000,000 54,000,000    
Cost of wholly owned real estate re-acquired as a result of mortgage loan foreclosure $ 56,000,000 $ 56,000,000    
Number of mortgage loans, foreclosure probable | loan 0 0    
Mortgage Loans        
Net Investment Income [Line Items]        
Non-accruing Loans $ 36,000,000 $ 36,000,000 127,000,000  
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 693,000,000 693,000,000 626,000,000  
Accrued interest written off   0 0 $ 0
Amortized cost of fixed maturities available-for-sale 84,700,000,000 84,700,000,000 74,000,000,000.0  
Fixed maturities | Non-Investment Grade        
Net Investment Income [Line Items]        
Available-for-sale securities, amortized cost basis other than investment grade $ 1,900,000,000 $ 1,900,000,000 $ 2,600,000,000  
Percentage of available for sale securities 2.30% 2.30% 3.50%  
Unrealized loss on available for sale securities $ 64,000,000 $ 64,000,000 $ 101,000,000  
Public Corporate        
Net Investment Income [Line Items]        
Exposure in single issuer of total investments $ 400,000,000 $ 400,000,000 $ 360,000,000  
Debt securities exposure in single issuer of total investments, percentage 11.60% 11.60% 8.20%  
Amortized cost of fixed maturities available-for-sale $ 55,218,000,000 $ 55,218,000,000 $ 49,786,000,000  
12 months or longer, gross unrealized losses $ 5,901,000,000 $ 5,901,000,000 $ 5,231,000,000