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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 548 $ 625
Sales (221) (17)
Maturities (110) (53)
Settlements (55) (139)
Calls (49) (7)
Total 113 409
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 336 267
Sales (73) (2)
Maturities 2 (7)
Settlements (51) (51)
Calls (49) (7)
Total 165 200
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 37 149
Settlements (15)  
Total 22 149
Trading Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 37 207
Sales (25)  
Settlements (18) (1)
Total (6) 206
Derivative Investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 118 131
Sales (123) (15)
Maturities (112) (46)
Total (117) 70
Indexed Annuity Ceded Embedded Derivatives [Member] | Other Assets [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 9 19
Settlements (22) (126)
Total (13) (107)
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 11 (148)
Settlements 51 39
Total $ 62 $ (109)