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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 294 $ 126
Sales (59) 213
Maturities (125) (112)
Settlements (48) (25)
Calls   (95)
Total 62 107
Corporate Bonds [Member] | Fixed maturity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 223 38
Sales (53) (62)
Maturities (2) (22)
Settlements (94) (63)
Calls   (95)
Total 74 (204)
RMBS [Member] | Fixed maturity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   4
Total   4
CMBS [Member] | Fixed maturity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 21 41
Settlements (1)  
Total 20 41
CLOs [Member] | Fixed maturity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 2 5
Total 2 5
Equity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   7
Sales   (2)
Total   5
Trading securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   2
Sales   (17)
Settlements   (1)
Total   (16)
Equity Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 1  
Total 1  
Derivative investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 68 47
Sales (6) 294
Maturities (123) (90)
Total (61) 251
Indexed annuity and embedded derivatives [Member] | Other assets [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 6  
Total 6  
Indexed annuity and embedded derivatives [Member] | Future contract benefits [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances (27)  
Settlements 47  
Total $ 20  
Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   (18)
Settlements   39
Total   $ 21