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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 94,709	$ 93,355
Debt Securities, Available-for-sale, Allowance for Credit Loss	(168)	(169)	$ (27)	$ (14)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	398	174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(6,575)	(8,140)
Available for sale, Fair Value	88,364	85,220
U.S. Treasury / Agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,798	2,792
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	8	5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(127)	(171)
Available for sale, Fair Value	2,679	2,626
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	28,860	28,064
Debt Securities, Available-for-sale, Allowance for Credit Loss	(60)	(59)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	263	108
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,671)	(2,205)
Available for sale, Fair Value	27,392	25,908
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	41,316	40,547
Debt Securities, Available-for-sale, Allowance for Credit Loss	(106)	(107)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	104	49
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,854)	(3,534)
Available for sale, Fair Value	38,460	36,955
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	17,863	17,871
Debt Securities, Available-for-sale, Allowance for Credit Loss	(2)	(3)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11	4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,770)	(2,021)
Available for sale, Fair Value	16,102	15,851
Municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,872	4,081
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	12	8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(153)	(209)
Available for sale, Fair Value	$ 3,731	$ 3,880

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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