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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3 $ 170 $ 106 $ 334 $ 211
Transfers Out of Level 3 (679) (93) (704) (99)
Transfers In or Out of Level 3, Net (509) 13 (370) 112
Transfers between Levels 1 and 2     172  
Corporate bonds [Member] | Fixed maturity AFS securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3 165 79 329 159
Transfers Out of Level 3 (83) (76) (107) (77)
Transfers In or Out of Level 3, Net 82 3 222 82
ABS [Member] | Fixed maturity AFS securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3 4   4  
Transfers In or Out of Level 3, Net 4   4  
CLOs [Member] | Fixed maturity AFS securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3   4   4
Transfers Out of Level 3 (586) (16) (586) (16)
Transfers In or Out of Level 3, Net (586) (12) (586) (12)
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3   23   48
Transfers Out of Level 3       (5)
Transfers In or Out of Level 3, Net   23   43
Equity AFS securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers Out of Level 3   (1)   (1)
Transfers In or Out of Level 3, Net   $ (1)   $ (1)
Trading securities [Member]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In to Level 3 1   1  
Transfers Out of Level 3 (10)   (11)  
Transfers In or Out of Level 3, Net $ (9)   $ (10)