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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
issue
loan
note
Loan
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
loan
extension
Dec. 31, 2024
USD ($)
issue
Net Investment Income [Line Items]        
Number of positions in unrealized loss position | issue 4,032     4,307
Debt securities exposure in single issuer greater than stated percentage of total investments 0.40%      
Amortized cost of fixed maturities available-for-sale $ 85,230,000,000     $ 84,717,000,000
12 months or longer, gross unrealized losses 7,576,000,000     8,188,000,000
Loaned securities $ 974,000,000     134,000,000
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%      
Cash collateral $ 998,000,000     137,000,000
Allowance for credit losses 272,000,000 $ 297,000,000   278,000,000
Non-accruing Loans $ 93,000,000     93,000,000
Number of loans | loan 0   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     1.30%  
Number of troubled debt restructuring extensions | extension     2  
Separate account equity investment carrying value 54,000,000     64,000,000
Interest credited to policyholders account balances participating group annuity contracts 0 0    
Recurring        
Net Investment Income [Line Items]        
Trading securities, at fair value 1,203,000,000     1,089,000,000
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 102,000,000     96,000,000
Accrued interest written off $ 0 0    
Individually Assessed Mortgage Loans        
Net Investment Income [Line Items]        
Number of mortgage loans, foreclosure probable | Loan 0      
Mortgage Loans        
Net Investment Income [Line Items]        
Non-accruing Loans $ 37,000,000     36,000,000
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 707,000,000     693,000,000
Accrued interest written off 0 $ 0    
Amortized cost of fixed maturities available-for-sale 85,200,000,000     84,700,000,000
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
Percentage of available for sale securities 2.20%     2.30%
Unrealized loss on available for sale securities $ 60,000,000     $ 64,000,000
Public Corporate        
Net Investment Income [Line Items]        
Exposure in single issuer of total investments $ 350,000,000     $ 400,000,000
Debt securities exposure in single issuer of total investments, percentage 8.30%     11.70%
Amortized cost of fixed maturities available-for-sale $ 54,248,000,000     $ 55,218,000,000
12 months or longer, gross unrealized losses $ 5,515,000,000     $ 5,901,000,000