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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 126 $ 174
Sales 213 (35)
Maturities (112) (18)
Settlements (25) (8)
Calls (95) (57)
Total 107 56
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 38 116
Sales (62) 9
Maturities (22) (4)
Settlements (63) (36)
Calls (95) (57)
Total (204) 28
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 41  
Sales   (1)
Total 41 (1)
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 5 40
Settlements   (2)
Total 5 38
Equity AFS securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 7 4
Sales (2)  
Total 5 4
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) (1)
Total (16) (1)
Derivative investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 47 40
Sales 294 (43)
Maturities (90) (14)
Total 251 (17)
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 (18) (26)
Settlements 39 31
Total $ 21 $ 5