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Investments (Summary Of Amortized Cost And Fair Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fixed maturity securities - available for sale:
Amortized Cost	$ 24,191	$ 22,064
Fair Value	22,236	22,308
Fixed Maturity Securities [Member]
Fixed maturity securities - available for sale:
Due in one year or less, Amortized Cost	1,331	1,399
Due after one year through five years, Amortized Cost	8,131	7,075
Due after five years through ten years, Amortized Cost	4,636	5,004
Due after ten years, Amortized Cost	1,454	1,606
Amortized Cost	24,191	22,064
Due in one year or less, Fair Value	1,314	1,398
Due after one year through five years, Fair Value	7,546	7,154
Due after five years through ten years, Fair Value	4,057	5,101
Due after ten years, Fair Value	1,233	1,627
Fair Value	22,236	22,308
Fixed maturity securities - held to maturity:
Due in one year or less, Amortized Cost	5
Due after one year through five years, Amortized Cost	63
Due after five years through ten years, Amortized Cost	43
Due after ten years, Amortized Cost	68
Amortized Cost	848
Due in one year or less, Fair Value	5
Due after one year through five years, Fair Value	61
Due after five years through ten years, Fair Value	41
Due after ten years, Fair Value	65
Fair Value	821
Asset-Backed Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	4,229	3,579
Fair Value	4,063	3,582
Fixed maturity securities - held to maturity:
Amortized Cost	661
Fair Value	642
Mortgage-Backed Securities: Commercial [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,023	1,032
Fair Value	919	1,064
Fixed maturity securities - held to maturity:
Amortized Cost	7
Fair Value	7
Mortgage Backed Securities: Agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,382	2,361
Fair Value	3,099	2,375
Mortgage Backed Securities: Non-agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	5	7
Fair Value	$ 4	$ 7

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