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Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 $ 51 $ 11 $ 141 $ 80
Transfers Out of Level 3 (286) (159) (815) (530)
Transfers Into or Out of Level 3, Net (235) (148) (674) (450)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 51 11 136 54
Transfers Out of Level 3   (42) (171) (125)
Transfers Into or Out of Level 3, Net 51 (31) (35) (71)
ABS [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Out of Level 3 (173) (111) (396) (204)
Transfers Into or Out of Level 3, Net (173) (111) (396) (204)
RMBS [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Out of Level 3     (7) (12)
Transfers Into or Out of Level 3, Net     (7) (12)
CMBS [Member] | Fixed Maturity AFS Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Out of Level 3       (21)
Transfers Into or Out of Level 3, Net       (21)
Equity AFS Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Out of Level 3       (162)
Transfers Into or Out of Level 3, Net       (162)
Trading Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3     5  
Transfers Out of Level 3 (113) (6) (241) (6)
Transfers Into or Out of Level 3, Net $ (113) $ (6) $ (236) (6)
Equity Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3       26
Transfers Into or Out of Level 3, Net       $ 26