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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 109,355		$ 93,355
Debt Securities, Available-for-sale, Allowance for Credit Loss	(158)	$ (193)	(169)	$ (147)	$ (78)	$ (14)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	310		174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(9,741)		(8,140)
Available for sale, Fair Value	99,766		85,220
U.S. Treasury / Agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,944		2,792
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2		5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(265)		(171)
Available for sale, Fair Value	3,681		2,626
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	34,912		28,064
Debt Securities, Available-for-sale, Allowance for Credit Loss	(53)		(59)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	239		108
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,381)		(2,205)
Available for sale, Fair Value	32,717		25,908
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	44,932		40,547
Debt Securities, Available-for-sale, Allowance for Credit Loss	(104)		(107)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	61		49
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(4,034)		(3,534)
Available for sale, Fair Value	40,855		36,955
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	22,402		17,871
Debt Securities, Available-for-sale, Allowance for Credit Loss	(1)		(3)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,802)		(2,021)
Available for sale, Fair Value	19,605		15,851
Municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,165		4,081
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2		8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(259)		(209)
Available for sale, Fair Value	$ 2,908		$ 3,880

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