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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 730 $ 548
Sales (194) (221)
Maturities (197) (110)
Settlements (27) (55)
Calls (17) (49)
Total 295 113
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 297 336
Sales (4) (73)
Maturities (15) 2
Settlements (91) (51)
Calls (17) (49)
Total 170 165
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 200 37
Settlements (17) (15)
Total 183 22
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Sales (20)  
Total (20)  
Mortgage Loans On Real Estate [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 72  
Sales (35)  
Total 37  
Trading Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 88 37
Sales (3) (25)
Settlements (19) (18)
Total 66 (6)
Equity Securities [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  
Sales (8)  
Total (4)  
Derivative Investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 174 118
Sales (124) (123)
Maturities (182) (112)
Total (132) (117)
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 3 9
Settlements (58) (22)
Total (55) (13)
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 (108) 11
Settlements 158 51
Total $ 50 $ 62