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Investments (Summary Of Amortized Cost And Fair 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	$ 23,204	$ 22,064
Fair Value	21,009	22,308
Fixed Maturity Securities [Member]
Fixed maturity securities - available for sale:
Due in one year or less, Amortized Cost	1,257	1,399
Due after one year through five years, Amortized Cost	7,875	7,075
Due after five years through ten years, Amortized Cost	4,603	5,004
Due after ten years, Amortized Cost	1,456	1,606
Amortized Cost	23,204	22,064
Due in one year or less, Fair Value	1,258	1,398
Due after one year through five years, Fair Value	7,216	7,154
Due after five years through ten years, Fair Value	3,938	5,101
Due after ten years, Fair Value	1,189	1,627
Fair Value	21,009	22,308
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	846
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	817
Asset-Backed Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,935	3,579
Fair Value	3,772	3,582
Fixed maturity securities - held to maturity:
Amortized Cost	653
Fair Value	639
Mortgage-Backed Securities: Commercial [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,016	1,033
Fair Value	908	1,064
Fixed maturity securities - held to maturity:
Amortized Cost	6
Fair Value	6
Mortgage Backed Securities: Agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,058	2,361
Fair Value	2,723	2,375
Mortgage Backed Securities: Non-agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	5	7
Fair Value	$ 5	$ 7

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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5B
-URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563

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