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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 482 $ 979 $ 985 $ 1,625
Sales (204) (12) (445) (42)
Maturities (91) (133) (200) (186)
Settlements (478) (10) (533) (149)
Calls (29)   (78) (7)
Total (320) 824 (271) 1,241
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 191 291 483 578
Sales (105) (16) (197) (31)
Maturities (36) (47) (34) (54)
Settlements (41) (34) (92) (84)
Calls (29)   (78) (7)
Total (20) 194 82 402
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 242 261 278 410
Settlements (6) (2) (21) (2)
Total 236 259 257 408
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 (4)   (4)  
Total (4)   (4)  
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 1 371 38 578
Sales     (25)  
Settlements (15)   (33) (1)
Total (14) 371 (20) 577
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 1 43 1 43
Sales (1)   (1)  
Total   43   43
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 131 141 249 272
Sales (94) 4 (218) (11)
Maturities (55) (86) (166) (132)
Total (18) 59 (135) 129
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 8 21 17 40
Settlements (447) (34) (469) (160)
Total (439) (13) (452) (120)
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 (92) (149) (81) (296)
Settlements 31 60 82 98
Total $ (61) $ (89) $ 1 $ (198)