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INVESTMENTS - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
loan
issue
note
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
loan
issue
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
extension
loan
issue
Net Investment Income [Line Items]          
Number of unrealized loss issues | issue 3,993   3,993   3,986
Debt securities exposure in single issuer greater than stated percentage of total investments 1.00%   1.00%    
Amortized cost of fixed maturities available-for-sale $ 61,707,000,000   $ 61,707,000,000   $ 61,884,000,000
12 months or longer, gross unrealized losses 7,823,000,000   7,823,000,000   6,836,000,000
Loaned securities $ 128,000,000   $ 128,000,000   91,000,000
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%   102.00%    
Cash collateral $ 131,000,000   $ 131,000,000   93,000,000
Allowance for credit loss $ 229,000,000 $ 145,000,000 229,000,000 $ 145,000,000 $ 277,000,000
Number of loans | loan 1       4
Number of loans split into notes | note 2        
Number of notes with original loan terms | note 1        
Amortized cost $ 65,200,000       $ 236,000,000
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 55,000,000   55,000,000   $ 48,000,000
Interest credited to policyholders account balances participating group annuity contracts 0 1,000,000 0 1,000,000  
Recurring          
Net Investment Income [Line Items]          
Trading securities, at fair value 756,000,000   756,000,000   $ 257,000,000
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 $ 86,000,000   86,000,000   $ 81,000,000
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 loss 54,000,000   54,000,000    
Cost of wholly owned real estate re-acquired $ 56,000,000   $ 56,000,000    
Number of mortgage loans, foreclosure probable | loan 0   0   0
Mortgage Loans          
Net Investment Income [Line Items]          
Non-accruing loans, carrying value $ 36,000,000   $ 36,000,000   $ 127,000,000
Fixed maturities          
Net Investment Income [Line Items]          
Accrued investment income receivable 535,000,000   535,000,000   528,000,000
Accrued interest written off 0 $ 0 0 $ 0  
Amortized cost of fixed maturities available-for-sale 61,700,000,000   61,700,000,000   61,900,000,000
Fixed maturities | Non-Investment Grade          
Net Investment Income [Line Items]          
Available-for-sale securities, amortized cost basis other than investment grade $ 2,000,000,000.0   $ 2,000,000,000.0   $ 2,500,000,000
Percentage of available for sale securities 3.30%   3.30%   4.10%
Unrealized loss on available for sale securities $ 101,000,000   $ 101,000,000   $ 102,000,000
Corporate          
Net Investment Income [Line Items]          
Exposure in single issuer of total investments $ 379,000,000   $ 379,000,000   $ 360,000,000
Debt securities exposure in single issuer of total investments, percentage 15.50%   15.50%   21.90%
Amortized cost of fixed maturities available-for-sale $ 42,209,000,000   $ 42,209,000,000   $ 42,014,000,000
12 months or longer, gross unrealized losses $ 5,650,000,000   $ 5,650,000,000   $ 4,839,000,000