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INVESTMENTS - Narrative (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
issue
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
issue
Net Investment Income [Line Items]      
Number of unrealized loss issues | issue 1,088   891
Debt securities exposure in single issuer greater than stated percentage of total investments 1.40%    
Amortized cost of fixed maturities available-for-sale $ 11,551,000,000   $ 10,050,000,000
Unrealized loss on available for sale securities 0   0
Gross unrealized losses 327,000,000   295,000,000
Loaned securities $ 21,000,000   23,000,000
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%    
Cash collateral $ 21,000,000   23,000,000
Financing receivable, allowance for credit loss, excluding accrued interest 3,000,000 $ 0 2,000,000
Separate account equity investment carrying value 1,000,000   1,000,000
Fair Value, Recurring      
Net Investment Income [Line Items]      
Trading securities 0   0
Commercial And Residential Mortgage Loans      
Net Investment Income [Line Items]      
Accrued investment income receivable 3,000,000   1,000,000
Accrued interest, written off 0 0  
Individually Assessed Mortgage Loans      
Net Investment Income [Line Items]      
Mortgage loans foreclosure probable 0   0
Financing receivable, allowance for credit loss, excluding accrued interest 0   0
Mortgage Loans      
Net Investment Income [Line Items]      
Non-accruing loans, amortized cost 0   0
Fixed maturities      
Net Investment Income [Line Items]      
Accrued investment income receivable 89,000,000   78,000,000
Accrued interest written off 0 $ 0  
Amortized cost of fixed maturities available-for-sale 11,600,000,000   10,100,000,000
Fixed maturities | External Credit Rating, Non Investment Grade      
Net Investment Income [Line Items]      
Available-for-sale securities, amortized cost $ 138,000,000   $ 92,000,000
Percentage of available for sale securities 1.20%   0.90%
Corporate      
Net Investment Income [Line Items]      
Debt securities exposure in single issuer of total investments $ 83,000,000   $ 82,000,000
Debt securities exposure in single issuer of total investments, percent 4.00%   3.80%
Amortized cost of fixed maturities available-for-sale $ 6,281,000,000   $ 5,842,000,000
Gross unrealized losses $ 301,000,000   $ 269,000,000