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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 645 $ 318
Sales (30) (63)
Maturities (53) (119)
Settlements (138) (46)
Calls (7)  
Total 417 90
Corporate Bonds [Member] | Fixed Maturity Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 287 248
Sales (15) (57)
Maturities (7) (2)
Settlements (50) (92)
Calls (7)  
Total 208 97
ABS [Member] | Fixed Maturity Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 52  
Total 52  
CMBS [Member] | Fixed Maturity Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   21
Settlements   (1)
Total   20
CLOs [Member] | Fixed Maturity Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 97 2
Total 97 2
Trading Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 207  
Settlements (1)  
Total 206  
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 131 67
Sales (15) (6)
Maturities (46) (117)
Total 70 (56)
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 19 6
Settlements (126)  
Total (107) 6
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances (148) (27)
Settlements 39 47
Total $ (109) $ 20