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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
issue
Mar. 31, 2022
USD ($)
Dec. 31, 2027
Dec. 31, 2023
Dec. 31, 2022
USD ($)
issue
Dec. 31, 2021
USD ($)
Net Investment Income [Line Items]            
Number of positions in unrealized loss position | issue 4,949       5,209  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.90%          
Fixed maturities available-for-sale, amortized cost $ 73,061,000,000       $ 72,991,000,000  
12 months or longer, gross unrealized losses 7,411,000,000       5,295,000,000  
Allowance for credit losses 139,000,000 $ 53,000,000     129,000,000  
Non-accruing loans, carrying value 17,000,000          
Separate account equity investment carrying value 46,000,000       39,000,000  
Mortgage loans on real estate (net of allowance for credit losses of $139 and $129) [1] 16,969,000,000       16,481,000,000  
Forecast            
Net Investment Income [Line Items]            
Interest rate of debt     5.00% 0.35%    
Recurring            
Net Investment Income [Line Items]            
Trading securities, at fair value 828,000,000       677,000,000  
Agricultural Mortgage Loans            
Net Investment Income [Line Items]            
Accrued investment income receivable 72,000,000       71,000,000  
Accrued interest, written off 0 0        
Allowance for credit losses 6,000,000 6,000,000     6,000,000 $ 5,000,000
Commercial Mortgage Loans            
Net Investment Income [Line Items]            
Accrued investment income receivable 72,000,000       71,000,000  
Accrued interest, written off 0 0        
Allowance for credit losses 133,000,000 47,000,000     123,000,000 $ 57,000,000
Non-accruing loans, carrying value         14,000,000  
Financing receivable, troubled debt restructuring 56,000,000          
Individually Assessed Mortgage Loans            
Net Investment Income [Line Items]            
Mortgage loans foreclosure probable 0          
Allowance for credit losses $ 0          
Real Estate Loan            
Net Investment Income [Line Items]            
Percentage of mortgage loans on real estate 0.30%          
Mortgage Loans            
Net Investment Income [Line Items]            
Mortgage loans on real estate (net of allowance for credit losses of $139 and $129) $ 2,000,000       2,000,000  
Fixed maturities            
Net Investment Income [Line Items]            
Accrued investment income receivable 616,000,000       591,000,000  
Accrued interest, written off 0 $ 0        
Fixed maturities available-for-sale, amortized cost 73,100,000,000       73,000,000,000  
Fixed maturities | Non-Investment Grade | Other Than Investment Grade            
Net Investment Income [Line Items]            
Available-for-sale securities, amortized cost basis other than investment grade $ 2,800,000,000       $ 2,900,000,000  
Percentage of available for sale securities 3.80%       4.00%  
Unrealized loss on available for sale securities $ 166,000,000       $ 208,000,000  
Public Corporate            
Net Investment Income [Line Items]            
Exposure in single issuer of total investments $ 387,000,000       $ 327,000,000  
Debt securities exposure in single issuer of total investments, percentage 7.10%       10.40%  
Fixed maturities available-for-sale, amortized cost $ 51,030,000,000       $ 50,712,000,000  
12 months or longer, gross unrealized losses $ 5,683,000,000       $ 4,536,000,000  
[1] See Note 2 of the Notes to these Consolidated Financial Statements for details of balances with VIEs.