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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances $ 521.0 $ 298.0 $ 1,847.0 $ 1,905.0
Sales (47.0) (139.0) (322.0) (465.0)
Maturities (1.0) (50.0) (35.0) (74.0)
Settlements (120.0) (194.0) (635.0) (632.0)
Calls   (8.0) (13.0) (46.0)
Total 353.0 (93.0) 842.0 688.0
Corporate Bonds [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 435.0 207.0 1,825.0 1,105.0
Sales (47.0) (138.0) (164.0) (236.0)
Maturities   (50.0) (34.0) (74.0)
Settlements (35.0) (51.0) (314.0) (179.0)
Calls   (2.0) (11.0) (33.0)
Total 353.0 (34.0) 1,302.0 583.0
RMBS [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances   9.0 5.0 21.0
Total   9.0 5.0 21.0
CMBS [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances       17.0
Settlements     (4.0)  
Total     (4.0) 17.0
ABS [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 279.0 213.0 736.0 768.0
Sales     (2.0)  
Settlements (32.0) (90.0) (167.0) (185.0)
Calls       (7.0)
Total 247.0 123.0 567.0 576.0
State And Municipal Bonds [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Sales     (1.0)  
Total     (1.0)  
Hybrid And Redeemable Preferred Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Calls   (6.0) (2.0) (6.0)
Total   (6.0) (2.0) (6.0)
Mortgage Loans On Real Estate [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 1.0 2.0 5.0 14.0
Settlements (89.0) (30.0) (179.0) (232.0)
Total (88.0) (28.0) (174.0) (218.0)
Trading Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances   11.0   282.0
Sales     (155.0) (220.0)
Settlements (4.0) (8.0) (81.0) (205.0)
Total (4.0) 3.0 (236.0) (143.0)
Equity Securities [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances     1.0 32.0
Sales   (1.0)   (9.0)
Total   (1.0) 1.0 23.0
Derivative Investments [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 9.0   9.0  
Maturities (1.0)   (1.0)  
Total 8.0   8.0  
Indexed Annuity Ceded Embedded Derivatives [Member] | Other Assets [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances 28.0 37.0 112.0 76.0
Settlements 4.0 26.0 (14.0) 66.0
Total 32.0 63.0 98.0 142.0
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]        
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]        
Issuances (231.0) (181.0) (846.0) (410.0)
Settlements 36.0 (41.0) 124.0 103.0
Total $ (195.0) $ (222.0) $ (722.0) $ (307.0)