Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	$ 15,215	$ 8,094
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,217)	(128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	4,432	1,241
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(764)	(75)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	19,647	9,335
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,982)	(203)
No Recorded Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	15,213
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,217)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	4,432
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(764)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	19,645
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,982)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	668	504
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(31)	(6)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	487	92
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(52)	(4)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	1,155	596
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(82)	(10)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	235	51
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(23)	(1)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	27	3
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	261	54
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(32)	(1)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	4,143	2,133
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(326)	(38)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	1,316	473
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(234)	(24)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	5,459	2,605
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(561)	(63)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	3,204	1,954
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(142)	(11)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	456	42
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(29)	(1)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	3,661	1,996
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(171)	(12)
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	806	222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(90)	(3)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	101	40
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(15)	(3)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	907	262
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(105)	(6)
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	1,905	1,101
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(132)	(12)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	870	280
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(158)	(7)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	2,776	1,381
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(289)	(19)
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	4	2
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	1
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	4	2
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	985	392
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(100)	(10)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	321	101
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(79)	(18)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	1,306	493
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(179)	(28)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	3,264	1,735
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(372)	(46)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	853	211
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(189)	(18)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	4,117	1,945
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(561)	$ (65)
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	2
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	2
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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