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Investments (Schedule Of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost $ 514 $ 666        
Net Unrealized Gain/(Loss) Position 57 29        
Fair Value 571 695        
OTTI in Credit Losses 378 430 $ 390 $ 436 $ 431 $ 382
Corporate bonds [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost 20 80        
Net Unrealized Gain/(Loss) Position 5 5        
Fair Value 25 85        
OTTI in Credit Losses 32 77        
ABS [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost 193 212        
Net Unrealized Gain/(Loss) Position 23 13        
Fair Value 216 225        
OTTI in Credit Losses 111 112        
RMBS [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost 275 332        
Net Unrealized Gain/(Loss) Position 22 6        
Fair Value 297 338        
OTTI in Credit Losses 188 194        
CMBS [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost 15 29        
Net Unrealized Gain/(Loss) Position 3 1        
Fair Value 18 30        
OTTI in Credit Losses 39 39        
CLOs [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost 11 11        
Net Unrealized Gain/(Loss) Position 4 4        
Fair Value 15 15        
OTTI in Credit Losses 5 5        
State and municipal bonds [Member]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Amortized Cost   2        
Fair Value   2        
OTTI in Credit Losses $ 3 $ 3