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Investments (AFS by type) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Investments    
Amortized cost $ 19,512  
Allowance for credit losses [1] 13  
Fair value 21,587  
Investments purchased from affiliate 368  
Accrued interest excluded from amortized cost basis on Available-for-Sale securities 153 $ 158
Fair value of securities owned and pledged as collateral 3,500 1,900
Fair value of securities owned and pledged as collateral which are eligible for rehypothecation 426 576
Corporate debt securities [Member]    
Investments    
Amortized cost 9,844 10,188
Gross unrealized gains 1,519 1,336
Gross unrealized losses (33) (2)
Allowance for credit losses (13)  
Fair value 11,317 11,522
Residential mortgage backed securities [Member]    
Investments    
Amortized cost 3,213 3,039
Gross unrealized gains 124 73
Gross unrealized losses (2) (4)
Allowance for credit losses 0  
Fair value 3,335 3,108
Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 3,789 3,526
Gross unrealized gains 199 95
Gross unrealized losses (10) (3)
Allowance for credit losses 0  
Fair value 3,978 3,618
State and municipal obligations [Member]    
Investments    
Amortized cost 1,048 1,071
Gross unrealized gains 274 237
Gross unrealized losses (2) (2)
Allowance for credit losses 0  
Fair value 1,320 1,306
Asset backed securities [Member]    
Investments    
Amortized cost 1,371 1,036
Gross unrealized gains 36 45
Gross unrealized losses (32) (1)
Allowance for credit losses 0  
Fair value 1,375 1,080
Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 246 250
Gross unrealized gains 17 19
Gross unrealized losses (2) (2)
Allowance for credit losses 0  
Fair value 261 267
U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 1 1
Fair value 1 1
Total fixed maturities [Member]    
Investments    
Amortized cost 19,512 19,111
Gross unrealized gains 2,169 1,805
Gross unrealized losses (81) (14)
Allowance for credit losses (13)  
Fair value $ 21,587 $ 20,902
Fixed maturity securities as percentage of total investments 84.00% 83.00%
Fixed maturity securities rated internally $ 607 $ 615
[1] Prior to January 1, 2020, the allowance for credit losses is not applicable to Available-for-Sale securities and Reinsurance recoverables. See Notes 2, 3, 6 and 7 for more information.