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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	Dec. 31, 2022	Dec. 31, 2021
Fixed maturity securities - available for sale:
Amortized Cost	$ 24,191	$ 22,064
Allowance for Credit Losses	(54)	(30)
Fair Value	22,236	22,308
Fixed maturity securities - held to maturity:
Allowance for credit losses	(9)
Fair Value	821
Fixed Maturity Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	24,191	22,064
Allowance for Credit Losses	(54)	(30)
Unrealized Appreciation	81	478
Unrealized Depreciation	(1,982)	(203)
Fair Value	22,236	22,308
Fixed maturity securities - held to maturity:
Amortized Cost	848
Allowance for credit losses	(9)
Unrealized Appreciation	3
Unrealized Depreciation	(22)
Fair Value	821
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,334	1,407
Allowance for Credit Losses
Unrealized Appreciation	6	24
Unrealized Depreciation	(82)	(10)
Fair Value	1,257	1,421
Obligations Of U.S. States And Political Subdivisions [Member]
Fixed maturity securities - available for sale:
Amortized Cost	444	559
Allowance for Credit Losses
Unrealized Appreciation	2	29
Unrealized Depreciation	(32)	(1)
Fair Value	413	587
Corporate Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	7,044	7,444
Allowance for Credit Losses	(45)	(19)
Unrealized Appreciation	31	195
Unrealized Depreciation	(561)	(63)
Fair Value	6,469	7,557
Fixed maturity securities - held to maturity:
Amortized Cost	152
Allowance for credit losses	(2)
Unrealized Appreciation
Unrealized Depreciation	(6)
Fair Value	144
Asset-Backed Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	4,229	3,579
Allowance for Credit Losses		(8)
Unrealized Appreciation	5	22
Unrealized Depreciation	(171)	(12)
Fair Value	4,063	3,582
Fixed maturity securities - held to maturity:
Amortized Cost	661
Allowance for credit losses	(6)
Unrealized Appreciation	2
Unrealized Depreciation	(15)
Fair Value	642
Mortgage-Backed Securities: Commercial [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,023	1,032
Allowance for Credit Losses
Unrealized Appreciation		38
Unrealized Depreciation	(105)	(6)
Fair Value	919	1,064
Fixed maturity securities - held to maturity:
Amortized Cost	7
Allowance for credit losses
Unrealized Appreciation
Unrealized Depreciation
Fair Value	7
Mortgage Backed Securities: Agency residential [Member]
Fixed maturity securities - available for sale:
Amortized Cost	3,382	2,361
Allowance for Credit Losses
Unrealized Appreciation	7	33
Unrealized Depreciation	(290)	(19)
Fair Value	3,099	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	(1)
Fair Value	4	7
Foreign Government Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	1,586	1,424
Allowance for Credit Losses
Unrealized Appreciation	8	42
Unrealized Depreciation	(179)	(28)
Fair Value	1,415	1,438
Foreign Corporate Securities [Member]
Fixed maturity securities - available for sale:
Amortized Cost	5,143	4,251
Allowance for Credit Losses	(10)	(3)
Unrealized Appreciation	23	95
Unrealized Depreciation	(562)	(65)
Fair Value	4,596	$ 4,279
Fixed maturity securities - held to maturity:
Amortized Cost	28
Allowance for credit losses	(1)
Unrealized Appreciation	2
Unrealized Depreciation
Fair Value	$ 28

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