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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 $ 56 $ 265 $ 285
Transfers Out of Level 3 (210) (217) (562) (491)
Total (156) (161) (297) (206)
Corporate Bonds [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3 36 37 194 265
Transfers Out of Level 3 (79) (53) (198) (167)
Total (43) (16) (4) 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) (14)
Total 7   7 (14)
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)
ABS [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Into Level 3   15 2 16
Transfers Out of Level 3 (113) (162) (346) (273)
Total (113) (147) (344) (257)
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 4 6 4
Transfers Out of Level 3   (1)   (5)
Total $ 6 3 6 (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   $ (1) $ 31 $ (15)