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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 585 $ 254 $ 2,211 $ 1,215
Sales (41) 452 (84) 250
Maturities (95) (121) (280) (351)
Settlements (56) 11 (206) (58)
Calls (16) (8) (23) (69)
Total 377 588 1,618 987
Corporate Bonds [Member] | Fixed Maturity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 323 186 901 882
Sales (4) (3) (35) (163)
Maturities (21) (1) (75) (3)
Settlements (43) (65) (127) (236)
Calls (16) (8) (23) (69)
Total 239 109 641 411
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Sales       (5)
Total       (5)
RMBS [Member] | Fixed Maturity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 10 7 10 7
Total 10 7 10 7
CMBS [Member] | Fixed Maturity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 7 18 7 39
Settlements       (2)
Total 7 18 7 37
ABS [Member] | Fixed Maturity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 79 17 489 186
Sales       (17)
Settlements (10)   (12)  
Total 69 17 477 169
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 150 2 728 4
Sales       (24)
Settlements (4)   (5)  
Total 146 2 723 (20)
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances     43 1
Sales (3)   (3) (1)
Total (3)   40  
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 131 96 403 225
Sales (34) 455 (46) 460
Maturities (74) (120) (205) (348)
Total 23 431 152 337
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 9 11 50 29
Settlements (28)   (189)  
Total (19) 11 (139) 29
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 (124) (83) (420) (158)
Settlements 29 76 127 180
Total $ (95) $ (7) $ (293) $ 22