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INVESTMENTS - TEXTUAL (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]            
Securities sold under agreements to repurchase $ 1,900   $ 1,900   $ 1,887  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.50%   0.50%      
Available-for-sale securities, amortized cost basis         34,988 $ 40,542
Gross unrealized losses of twelve months or more $ 611   $ 611   224  
Carrying value of fixed maturities non-income producing 2   2      
Investment expenses 17 $ 11 49 $ 40    
Trading securities, at fair value 14,760   14,760   12,628  
Separate account equity investment carrying value 52   52   49  
Commercial Mortgage Loans            
Debt Securities, Available-for-sale [Line Items]            
Mortgage loans classified as nonaccrual 19   19   19  
Other Than Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale securities, amortized cost $ 1,280   $ 1,280   $ 1,309  
Percentage of available for sale securities 3.20%   3.20%   3.80%  
Corporate            
Debt Securities, Available-for-sale [Line Items]            
Debt securities exposure in single issuer of total investments $ 200   $ 200   $ 182  
Available-for-sale securities, amortized cost basis         20,596  
Gross unrealized losses of twelve months or more 125   125   39  
Fixed Maturities            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale securities, amortized cost basis $ 40,542   40,542   34,831  
Fixed Maturities | Other Than Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Net unrealized losses     $ (11)   $ (5)