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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 174 $ 136
Sales (35) (72)
Maturities (18) (87)
Settlements (8) 11
Calls (57) (8)
Total 56 (20)
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 116 63
Sales 9 (1)
Maturities (4)  
Settlements (36) (26)
Calls (57) (7)
Total 28 29
CMBS [Member] | Fixed maturity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Sales (1)  
Settlements   (2)
Calls   (1)
Total (1) (3)
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 40 47
Settlements (2) (2)
Total 38 45
Equity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 4  
Sales   (24)
Total 4 (24)
Trading securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Settlements (1) (1)
Total (1) (1)
Derivative investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 40 40
Sales (43) (47)
Maturities (14) (87)
Total (17) (94)
Indexed annuity and IUL contracts 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 (26) (14)
Settlements 31 42
Total $ 5 $ 28