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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 319 $ 600 $ 1,349 $ 2,182
Sales (235) (39) (655) (68)
Maturities (181) (95) (382) (280)
Settlements (502) (57) (1,036) (208)
Calls (45) (16) (123) (23)
Total (644) 393 (847) 1,603
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 154 337 683 872
Sales (58)   (230) (18)
Maturities (3) (21) (37) (75)
Settlements (18) (44) (112) (129)
Calls (45) (16) (123) (23)
Total 30 256 181 627
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Maturities (20)   (20)  
Total (20)   (20)  
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   10   10
Total   10   10
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   7   7
Total   7   7
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 74 79 353 489
Settlements (14) (10) (35) (12)
Total 60 69 318 477
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]        
Issuances 14   14  
Sales     (4)  
Total 14   10  
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 15 150 53 728
Sales     (25)  
Maturities (20)   (20)  
Settlements (115) (4) (148) (5)
Total (120) 146 (140) 723
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances     21 43
Sales   (3) (1) (3)
Total   (3) 20 40
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 20      
Total 20      
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 126 132 374 403
Sales (177) (36) (395) (47)
Maturities (138) (74) (305) (205)
Total (189) 22 (326) 151
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 4 9 21 50
Settlements (427) (28) (896) (189)
Total (423) (19) (875) (139)
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 (88) (124) (170) (420)
Settlements 72 29 155 127
Total $ (16) $ (95) $ (15) $ (293)