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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 $ 344 $ 585 $ 1,327 $ 2,211
Sales (230) (41) (675) (84)
Maturities (181) (95) (382) (280)
Settlements (500) (56) (1,032) (206)
Calls (45) (16) (123) (23)
Total (612) 377 (885) 1,618
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 182 323 665 901
Sales (53) (4) (250) (35)
Maturities (3) (21) (37) (75)
Settlements (17) (43) (109) (127)
Calls (45) (16) (123) (23)
Total 64 239 146 641
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 79 352 489
Settlements (14) (10) (35) (12)
Total 60 69 317 477
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 13   13  
Sales     (4)  
Total 13   9  
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 (114) (4) (147) (5)
Total (119) 146 (139) 723
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 18   19 43
Sales   (3) (1) (3)
Total 18 (3) 18 40
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 126 131 374 403
Sales (177) (34) (395) (46)
Maturities (138) (74) (305) (205)
Total (189) 23 (326) 152
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 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)