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Reinsurance (Schedule Of Assets In Support Of Reserves) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Ceded Credit Risk [Line Items]        
Fixed maturity AFS securities $ 118,252 $ 105,200    
Trading securities 4,633 4,673    
Equity securities 122 103    
Mortgage loans on real estate 16,541 16,339    
Derivative investments 3,236 1,911    
Other investments 4,204 2,994    
Cash and invested cash 2,595 2,563 $ 2,939 $ 2,345
Accrued investment income 1,320 1,148    
Other assets 15,667 16,170    
Athene Holding Ltd. [Member]        
Ceded Credit Risk [Line Items]        
Fixed maturity AFS securities 1,630 2,308    
Trading securities 3,488 3,534    
Equity securities 17 14    
Derivative investments 95 130    
Other investments 116 94    
Cash and invested cash 117 62    
Accrued investment income 43 57    
Other assets 3      
Total 6,303 6,897    
Commercial [Member]        
Ceded Credit Risk [Line Items]        
Mortgage loans on real estate 15,841 15,606    
Commercial [Member] | Athene Holding Ltd. [Member]        
Ceded Credit Risk [Line Items]        
Mortgage loans on real estate $ 794 $ 698