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Investments (Summary Of Amortized Cost, Allowance For Credit Losses, Gross Unrealized Appreciation/(Depreciation) And Fair Value Of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fixed maturity securities - available for sale:
Amortized Cost	$ 23,204	$ 22,064
Allowance for credit losses	(38)	(30)
Fair Value	21,009	22,308
Fixed maturity securities - held to maturity:
Allowance for credit losses	(9)
Fair Value	817
Fixed Maturity Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	23,204	22,064
Allowance for credit losses	(38)	(30)
Unrealized Appreciation	153	478
Unrealized Depreciation	(2,310)	(203)
Fair Value	21,009	22,308
Fixed maturity securities - held to maturity:
Amortized Cost	846
Allowance for credit losses	(9)
Unrealized Appreciation	1
Unrealized Depreciation	(21)
Fair Value	817
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,367	1,407
Allowance for credit losses
Unrealized Appreciation	19	24
Unrealized Depreciation	(79)	(10)
Fair Value	1,308	1,421
Obligations Of U.S. States And Political Subdivisions [Member]
Fixed maturity securities - available for sale:
Amortized Cost	519	559
Allowance for credit losses
Unrealized Appreciation	1	29
Unrealized Depreciation	(38)	(1)
Fair Value	481	587
Corporate Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	7,010	7,444
Allowance for credit losses	(29)	(19)
Unrealized Appreciation	69	195
Unrealized Depreciation	(653)	(63)
Fair Value	6,397	7,557
Fixed maturity securities - held to maturity:
Amortized Cost	160
Allowance for credit losses	(2)
Unrealized Appreciation
Unrealized Depreciation	(11)
Fair Value	147
Asset-Backed Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,935	3,579
Allowance for credit losses		(8)
Unrealized Appreciation	1	22
Unrealized Depreciation	(164)	(12)
Fair Value	3,772	3,582
Fixed maturity securities - held to maturity:
Amortized Cost	653
Allowance for credit losses	(6)
Unrealized Appreciation	1
Unrealized Depreciation	(10)
Fair Value	639
Mortgage-Backed Securities: Commercial [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,016	1,033
Allowance for credit losses
Unrealized Appreciation		38
Unrealized Depreciation	(108)	(6)
Fair Value	908	1,064
Fixed maturity securities - held to maturity:
Amortized Cost	6
Allowance for credit losses
Unrealized Appreciation
Unrealized Depreciation
Fair Value	6
Mortgage Backed Securities: Agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,058	2,361
Allowance for credit losses
Unrealized Appreciation	2	33
Unrealized Depreciation	(337)	(19)
Fair Value	2,723	2,375
Mortgage Backed Securities: Non-agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	5	7
Allowance for credit losses
Unrealized Appreciation
Unrealized Depreciation
Fair Value	5	7
Foreign Government Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,528	1,424
Allowance for credit losses
Unrealized Appreciation	13	42
Unrealized Depreciation	(205)	(28)
Fair Value	1,335	1,438
Foreign Corporate Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	4,768	4,251
Allowance for credit losses	(9)	(3)
Unrealized Appreciation	47	95
Unrealized Depreciation	(726)	(65)
Fair Value	4,080	$ 4,279
Fixed maturity securities - held to maturity:
Amortized Cost	28
Allowance for credit losses	(1)
Unrealized Appreciation
Unrealized Depreciation	(1)
Fair Value	$ 26

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