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INVESTMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
issue
Loan
Mar. 31, 2025
USD ($)
note
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
loan
extension
Sep. 30, 2025
USD ($)
note
issue
Loan
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
issue
Dec. 31, 2023
Net Investment Income [Line Items]                
Number of positions in unrealized loss position | issue 3,342       3,342   4,307  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.50%       0.50%      
Amortized cost of fixed maturities available-for-sale $ 80,753,000,000       $ 80,753,000,000   $ 84,717,000,000  
12 months or longer, gross unrealized losses 5,755,000,000       5,755,000,000   8,188,000,000  
Loaned securities 1,100,000,000       $ 1,100,000,000   134,000,000  
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral         102.00%      
Cash collateral 1,100,000,000       $ 1,100,000,000   137,000,000  
Allowance for credit losses 287,000,000   $ 261,000,000   287,000,000 $ 261,000,000 278,000,000  
Non-accruing Loans 70,000,000       $ 70,000,000   $ 93,000,000  
Number of loans | loan       4        
Number of loans split into notes | note   2     3      
Number of notes with original loan terms | note   1            
Amortized cost   $ 65,000,000   $ 169,000,000        
Percentage of total commercial mortgage loans representing amortized cost             0.40% 0.90%
Number of troubled debt restructuring extensions | extension       2        
Separate account equity investment carrying value 63,000,000       $ 63,000,000   $ 64,000,000  
Interest credited to policyholders account balances participating group annuity contracts 0   0   1,000,000 1,000,000    
Net investment income (loss) 1,343,000,000   1,308,000,000   3,946,000,000 3,685,000,000    
Investment gains (losses), net (1,170,000,000)   $ (46,000,000)   (1,255,000,000) (101,000,000)    
RGA Reinsurance Company                
Net Investment Income [Line Items]                
Investment gains (losses), net $ 1,100,000,000       $ 1,100,000,000      
Agricultural Sector                
Net Investment Income [Line Items]                
Percentage of total commercial mortgage loans representing amortized cost 0.30%       0.30%      
Cash                
Net Investment Income [Line Items]                
Cash collateral $ 77,000,000       $ 77,000,000   137,000,000  
Recurring                
Net Investment Income [Line Items]                
Trading securities, at fair value 1,595,000,000       1,595,000,000   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 $ 118,000,000       118,000,000   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       0      
Mortgage Loans                
Net Investment Income [Line Items]                
Non-accruing Loans $ 11,000,000       $ 11,000,000   36,000,000  
Note 1 | Agricultural Sector                
Net Investment Income [Line Items]                
Amortized cost         9,000,000      
Fixed maturities                
Net Investment Income [Line Items]                
Accrued investment income receivable 647,000,000       647,000,000   693,000,000  
Accrued interest written off         0 $ 0    
Amortized cost of fixed maturities available-for-sale 80,800,000,000       80,800,000,000   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 $ 1,800,000,000       $ 1,800,000,000   $ 1,900,000,000  
Percentage of available for sale securities 2.30%       2.30%   2.30%  
Unrealized loss on available for sale securities $ 63,000,000       $ 63,000,000   $ 64,000,000  
Public Corporate                
Net Investment Income [Line Items]                
Exposure in single issuer of total investments $ 402,000,000       $ 402,000,000   $ 400,000,000  
Debt securities exposure in single issuer of total investments, percentage 25.10%       25.10%   11.70%  
Amortized cost of fixed maturities available-for-sale $ 47,594,000,000       $ 47,594,000,000   $ 55,163,000,000  
12 months or longer, gross unrealized losses 3,944,000,000       3,944,000,000   $ 5,898,000,000  
Commercial mortgages:                
Net Investment Income [Line Items]                
Amortized cost $ 35,000,000       $ 35,000,000      
Percentage of total commercial mortgage loans representing amortized cost 0.20%       0.20%      
Financing Receivable, Modifications Contracts Modified During Period, Principal Balance $ 10,000,000       $ 10,000,000      
Extinguishment of debt, amount $ 61,000,000