Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (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)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	989	130
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(19)	(2)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	40	137
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(7)	(12)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	1,029	267
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(26)	(14)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	4,935	2,165
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(383)	(35)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	1,645	446
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(209)	(29)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	6,580	2,612
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(592)	(64)
Due In Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	2,698	1,728
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(360)	(47)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	911	244
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(230)	(22)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	3,609	1,972
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(590)	(69)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	672	792
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(91)	(16)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	408	51
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(116)	(3)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	1,080	843
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(207)	(19)
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 [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value	2,715	1,325
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(222)	(15)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value	972	320
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(173)	(10)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value	3,687	1,646
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(395)	$ (25)
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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