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INVESTMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
Sep. 30, 2020
USD ($)
numberOfLoan
security
Dec. 31, 2019
USD ($)
security
Net Investment Income [Line Items]      
Number of positions in unrealized loss position | security 729 729 413
Debt securities exposure in single issuer greater than stated percentage of total investments 0.70% 0.70%  
Amortized cost $ 70,294,000,000 $ 70,294,000,000  
Unrealized loss on available for sale securities 83,000,000 83,000,000  
Gross unrealized losses 59,000,000 59,000,000 $ 32,000,000
Allowance for credit loss 70,000,000 70,000,000  
Separate account equity investment carrying value 38,000,000 38,000,000 58,000,000
Corporate      
Net Investment Income [Line Items]      
Exposure in single issuer of total investments $ 373,000,000 $ 373,000,000 $ 309,000,000
Debt securities exposure in single issuer of total investments, percentage 2.00% 2.00% 2.10%
Gross unrealized losses $ 50,000,000 $ 50,000,000 $ 20,000,000
Fixed maturities      
Net Investment Income [Line Items]      
Accrued investment income receivable 547,000,000 547,000,000  
Accrued interest, written off 0 0  
Amortized cost 70,307,000,000 70,307,000,000 62,937,000,000
Commercial Mortgage Loans      
Net Investment Income [Line Items]      
Accrued investment income receivable 29,000,000 29,000,000  
Accrued interest, written off $ 0 $ 0  
Number of troubled debt restructuring | numberOfLoan   1  
Troubled debt restructuring, premodification   $ 75,000,000  
Troubled debt restructuring, postmodification   $ 75,000,000  
Troubled debt restructuring, percentage of total invested assets 0.07% 0.07%  
Agricultural Mortgage Loans      
Net Investment Income [Line Items]      
Accrued investment income receivable $ 32,000,000 $ 32,000,000  
Accrued interest, written off 0 0  
Individually Assessed Mortgage Loans      
Net Investment Income [Line Items]      
Mortgage loans foreclosure probable 0 0  
Allowance for credit loss $ 0 $ 0  
Privately Negotiated Fixed Maturity      
Net Investment Income [Line Items]      
Number of troubled debt restructuring | numberOfLoan   6  
Troubled debt restructuring, premodification   $ 50,000,000  
Troubled debt restructuring, postmodification   $ 44,000,000  
Troubled debt restructuring, percentage of total invested assets 0.04% 0.04%  
Fair Value, Measurements, Recurring      
Net Investment Income [Line Items]      
Trading securities, at fair value $ 6,244,000,000 $ 6,244,000,000 7,031,000,000
Other Than Investment Grade | External Credit Rating, Non Investment Grade | Fixed maturities      
Net Investment Income [Line Items]      
Available-for-sale securities, amortized cost basis other than investment grade $ 2,000,000,000.0 $ 2,000,000,000.0 $ 1,400,000,000
Percentage of available for sale securities 2.90% 2.90% 2.30%
Unrealized loss on available for sale securities     $ 21,000,000