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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
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Amortized Cost $ 571 $ 666    
Net Unrealized Gain/(Loss) Position 36 29    
Fair Value 607 695    
OTTI in Credit Losses 393 430 $ 413 $ 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 39 77    
ABS [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Amortized Cost 205 212    
Net Unrealized Gain/(Loss) Position 17 13    
Fair Value 222 225    
OTTI in Credit Losses 112 112    
RMBS [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Amortized Cost 312 332    
Net Unrealized Gain/(Loss) Position 9 6    
Fair Value 321 338    
OTTI in Credit Losses 195 194    
CMBS [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Amortized Cost 22 29    
Net Unrealized Gain/(Loss) Position 1 1    
Fair Value 23 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 1 2    
Fair Value 1 2    
OTTI in Credit Losses $ 3 $ 3