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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
issue
Dec. 31, 2021
USD ($)
issue
Dec. 31, 2022
USD ($)
issue
Dec. 31, 2021
USD ($)
issue
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Net Investment Income [Line Items]            
Number of positions in unrealized loss position | issue 5,209 2,060 5,209 2,060    
Debt securities exposure in single issuer greater than stated percentage of total investments 0.80%   0.80%      
Fixed maturities available-for-sale, amortized cost $ 72,991,000,000 $ 73,429,000,000 $ 72,991,000,000 $ 73,429,000,000    
Gross unrealized losses 5,295,000,000 91,000,000 5,295,000,000 91,000,000    
Allowance for credit losses 129,000,000 62,000,000 129,000,000 62,000,000 $ 81,000,000  
Non-accruing loans, carrying value 14,000,000   14,000,000      
Separate account equity investment carrying value 39,000,000 45,000,000 39,000,000 45,000,000    
Interest credited to policyholders account balances participating group annuity contracts     1,000,000 2,000,000 2,000,000  
Mortgage loans on real estate (net of allowance for credit losses of $53 and $62) [1] 16,481,000,000 14,033,000,000 16,481,000,000 14,033,000,000    
Fixed maturities            
Net Investment Income [Line Items]            
Accrued investment income receivable 591,000,000 506,000,000 591,000,000 506,000,000    
Accrued interest, written off 0 0 0 0    
Fixed maturities available-for-sale, amortized cost 73,000,000,000 73,400,000,000 73,000,000,000 73,400,000,000    
Corporate            
Net Investment Income [Line Items]            
Exposure in single issuer of total investments $ 327,000,000 $ 322,000,000 $ 327,000,000 $ 322,000,000    
Debt securities exposure in single issuer of total investments, percentage 10.40% 2.70% 10.40% 2.70%    
Fixed maturities available-for-sale, amortized cost $ 50,712,000,000 $ 50,172,000,000 $ 50,712,000,000 $ 50,172,000,000    
Gross unrealized losses 4,536,000,000 75,000,000 4,536,000,000 75,000,000    
Commercial Mortgage Loans            
Net Investment Income [Line Items]            
Accrued investment income receivable 71,000,000 57,000,000 71,000,000 57,000,000    
Accrued interest, written off     0 0    
Allowance for credit losses 123,000,000 57,000,000 123,000,000 57,000,000 77,000,000 $ 33,000,000
Non-accruing loans, carrying value   14,000,000   14,000,000    
Agricultural Mortgage Loans            
Net Investment Income [Line Items]            
Accrued investment income receivable 71,000,000 57,000,000 71,000,000 57,000,000    
Accrued interest, written off     0 0    
Allowance for credit losses 6,000,000 5,000,000 6,000,000 5,000,000 $ 4,000,000 $ 3,000,000
Individually Assessed Mortgage Loans            
Net Investment Income [Line Items]            
Mortgage loans foreclosure probable 0   0      
Allowance for credit losses 0   0      
Mortgage Loans            
Net Investment Income [Line Items]            
Mortgage loans on real estate (net of allowance for credit losses of $53 and $62) 2,000,000 2,000,000 2,000,000 2,000,000    
Recurring            
Net Investment Income [Line Items]            
Investment gains (losses), net 677,000,000 631,000,000 677,000,000 631,000,000    
Other Than Investment Grade | Non-Investment Grade | Fixed maturities            
Net Investment Income [Line Items]            
Available-for-sale securities, amortized cost basis other than investment grade $ 2,900,000,000 $ 2,900,000,000 $ 2,900,000,000 $ 2,900,000,000    
Percentage of available for sale securities 4.00% 3.90% 4.00% 3.90%    
Unrealized loss on available for sale securities $ 208,000,000 $ 18,000,000 $ 208,000,000 $ 18,000,000    
[1] See Note 2 of the Notes to these Consolidated Financial Statements for details of balances with VIEs.