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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 $ 54 $ 266 $ 56 $ 285
Transfers Out of Level 3 (210) (562) (217) (492)
Total (156) (296) (161) (207)
Corporate Bonds [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 36 195 37 265
Transfers Out of Level 3 (79) (198) (53) (167)
Total (43) (3) (16) 98
RMBS [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 12 12    
Transfers Out of Level 3 (5) (5)   (15)
Total 7 7   (15)
ABS [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3   2 15 16
Transfers Out of Level 3 (113) (346) (162) (273)
Total (113) (344) (147) (257)
CMBS [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3   4    
Transfers Out of Level 3       (17)
Total   4   (17)
Hybrid And Redeemable Preferred Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3   16    
Transfers Out of Level 3 (13) (13)    
Total (13) 3    
Trading Securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 6 6 4 4
Transfers Out of Level 3     (1) (5)
Total $ 6 6 3 (1)
Derivative Investments [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3   31    
Transfers Out of Level 3     (1) (15)
Total   $ 31 $ (1) $ (15)