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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
issue
loan
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
extension
loan
issue
Net Investment Income [Line Items]      
Number of positions in unrealized loss position | issue 4,380   4,402
Debt securities exposure in single issuer greater than stated percentage of total investments 0.70%    
Amortized cost of fixed maturities available-for-sale $ 75,270,000,000   $ 74,033,000,000
12 months or longer, gross unrealized losses 7,810,000,000   7,261,000,000
Loaned securities $ 144,000,000   113,000,000
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%    
Cash collateral $ 147,000,000   116,000,000
Allowance for credit losses $ 297,000,000 $ 139,000,000 $ 279,000,000
Number of loans | loan 0   4
Amortized cost $ 235,000,000   $ 234,000,000
Percentage of total commercial mortgage loans representing amortized cost 1.50%   1.50%
Number of troubled debt restructuring extensions | extension     2
Separate account equity investment carrying value $ 53,000,000   $ 49,000,000
Interest credited to policyholders account balances participating group annuity contracts 0 0  
Recurring      
Net Investment Income [Line Items]      
Trading securities, at fair value 1,340,000,000   $ 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 85,000,000   $ 82,000,000
Accrued interest written off $ 0 0  
Individually Assessed Mortgage Loans      
Net Investment Income [Line Items]      
Number of mortgage loans, foreclosure probable | loan 1   1
Mortgage loans foreclosure probable $ 108,000,000   $ 108,000,000
Allowance for credit losses 54,000,000   54,000,000
Mortgage Loans      
Net Investment Income [Line Items]      
Non-accruing loans, amortized cost 127,000,000   127,000,000
Fixed maturities      
Net Investment Income [Line Items]      
Accrued investment income receivable 643,000,000   626,000,000
Accrued interest written off 0 $ 0  
Amortized cost of fixed maturities available-for-sale 75,300,000,000   74,000,000,000
Fixed maturities | Non-Investment Grade      
Net Investment Income [Line Items]      
Available-for-sale securities, amortized cost basis other than investment grade $ 3,000,000,000   $ 2,600,000,000
Percentage of available for sale securities 4.00%   3.50%
Unrealized loss on available for sale securities $ 127,000,000   $ 101,000,000
Public Corporate      
Net Investment Income [Line Items]      
Exposure in single issuer of total investments $ 317,000,000   $ 360,000,000
Debt securities exposure in single issuer of total investments, percentage 8.40%   8.20%
Amortized cost of fixed maturities available-for-sale $ 49,975,000,000   $ 49,786,000,000
12 months or longer, gross unrealized losses $ 5,702,000,000   $ 5,231,000,000