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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 230 $ 237 $ 1,118 $ 588
Sales 455 (148) 257 34
Maturities (121) (131) (357) (367)
Settlements 11 (33) (60) (76)
Calls (8) (26) (69) (134)
Total 567 (101) 889 45
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 162 167 785 367
Sales   (114) (156) (179)
Maturities (1) (19) (3) (66)
Settlements (65) (43) (238) (170)
Calls (8) (26) (69) (134)
Total 88 (35) 319 (182)
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     22  
Sales     (17)  
Total     5  
U.S. 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]        
Sales     (5)  
Total     (5)  
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 7 6 7 10
Total 7 6 7 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 18   39 55
Settlements   (1) (2) (1)
Total 18 (1) 37 54
CLOs [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 17 15 164 33
Total 17 15 164 33
Equity AFS Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances   10   18
Sales   (1)   (3)
Total   9   15
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 2   4 2
Sales   (10) (24) (27)
Settlements       (1)
Total 2 (10) (20) (26)
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances     1  
Sales     (1)  
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 96 50 225 145
Sales 455 (23) 460 243
Maturities (120) (112) (354) (301)
Total 431 (85) 331 87
Indexed Annuity And Embedded Derivatives [Member] | Other Assets [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 11 3 29 3
Total 11 3 29 3
Indexed Annuity And Embedded Derivatives [Member] | Future Contract Benefits [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances (83) (14) (158) (45)
Settlements 76 11 180 96
Total $ (7) $ (3) $ 22 $ 51