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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 593 $ 225 $ 887 $ 351
Sales (139) (32) (198) 181
Maturities (111) (124) (236) (236)
Settlements (24) (17) (72) (42)
Calls (61) (13) (61) (108)
Total 258 39 320 146
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 400 162 623 200
Sales (103) (3) (156) (65)
Maturities   (25) (2) (47)
Settlements (79) (64) (173) (127)
Calls (61) (13) (61) (108)
Total 157 57 231 (147)
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   22  
Sales (17)   (17)  
Total 5   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)   (5)  
Total (5)   (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       4
Total       4
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   14 21 55
Settlements (1)   (2)  
Total (1) 14 19 55
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 145 13 147 18
Total 145 13 147 18
Equity AFS Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances   1   8
Sales       (2)
Total   1   6
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 2   2 2
Sales (24)   (24) (17)
Settlements       (1)
Total (22)   (22) (16)
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances     1  
Sales (1)   (1)  
Total (1)      
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 61 48 129 95
Sales 11 (29) 5 265
Maturities (111) (99) (234) (189)
Total (39) (80) (100) 171
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   17  
Total 11   17  
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 (48) (13) (75) (31)
Settlements 56 47 103 86
Total $ 8 $ 34 $ 28 $ 55