Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fixed maturity securities - available for sale:
Amortized Cost	$ 13,207	$ 12,733
Fair Value	12,070	12,860
Fixed maturity securities - held to maturity:
Due after one year through five years, Amortized Cost	61
Due after five years through ten years, Amortized Cost	46
Due after ten years, Amortized Cost	80
Amortized Cost	818
Due after one year through five years, Fair Value	58
Due after five years through ten years, Fair Value	41
Due after ten years, Fair Value	74
Fair Value	789
Fixed Maturity Securities [Member]
Fixed maturity securities - available for sale:
Due in one year or less, Amortized Cost	554	586
Due after one year through five years, Amortized Cost	3,730	3,488
Due after five years through ten years, Amortized Cost	2,034	2,260
Due after ten years, Amortized Cost	967	1,088
Due in one year or less, Fair Value	537	584
Due after one year through five years, Fair Value	3,455	3,527
Due after five years through ten years, Fair Value	1,752	2,310
Due after ten years, Fair Value	815	1,106
Asset-backed Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,801	3,464
Fair Value	3,645	3,466
Fixed maturity securities - held to maturity:
Amortized Cost	625
Fair Value	611
Commercial [Member]
Fixed maturity securities - available for sale:
Amortized Cost	556	586
Fair Value	495	603
Fixed maturity securities - held to maturity:
Amortized Cost	6
Fair Value	6
Agency Residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,562	1,255
Fair Value	1,367	1,261
Non-agency Residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3	4
Fair Value	$ 3	$ 4