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INVESTMENTS - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
loan
note
issue
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
loan
issue
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
issue
loan
extension
Net Investment Income [Line Items]          
Number of positions in unrealized loss position | issue 4,541   4,541   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 $ 79,797,000,000   $ 79,797,000,000   $ 74,033,000,000
12 months or longer, gross unrealized losses 8,333,000,000   8,333,000,000   7,261,000,000
Loaned securities 149,000,000   $ 149,000,000   113,000,000
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral     102.00%    
Cash collateral 152,000,000   $ 152,000,000   116,000,000
Allowance for credit losses $ 234,000,000 $ 145,000,000 234,000,000 $ 145,000,000 $ 279,000,000
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 56,000,000   56,000,000   $ 49,000,000
Interest credited to policyholders account balances participating group annuity contracts 0 0 1,000,000 1,000,000  
Recurring          
Net Investment Income [Line Items]          
Trading securities, at fair value 2,017,000,000   2,017,000,000   $ 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 $ 90,000,000   90,000,000   $ 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   0
Mortgage Loans          
Net Investment Income [Line Items]          
Non-accruing loans, amortized cost $ 36,000,000   $ 36,000,000   $ 127,000,000
Fixed maturities          
Net Investment Income [Line Items]          
Accrued investment income receivable 677,000,000   677,000,000   626,000,000
Accrued interest written off 0 $ 0 0 $ 0  
Amortized cost of fixed maturities available-for-sale 79,800,000,000   79,800,000,000   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 $ 2,100,000,000   $ 2,100,000,000   $ 2,600,000,000
Percentage of available for sale securities 2.60%   2.60%   3.50%
Unrealized loss on available for sale securities $ 101,000,000   $ 101,000,000   $ 101,000,000
Public 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 11.20%   11.20%   8.20%
Amortized cost of fixed maturities available-for-sale $ 52,490,000,000   $ 52,490,000,000   $ 49,786,000,000
12 months or longer, gross unrealized losses $ 6,118,000,000   $ 6,118,000,000   $ 5,231,000,000