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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 134,146		$ 124,726
Debt Securities, Available-for-sale, Allowance for Credit Loss	(53)	$ (48)	(52)	$ (50)	$ (71)	$ (70)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	401		1,954
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(8,690)		(3,948)
Available for sale, Fair Value	125,804		122,680
U.S. and local government securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,777		3,908
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3		27
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(393)		(221)
Available for sale, Fair Value	3,387		3,714
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	44,320		40,479
Debt Securities, Available-for-sale, Allowance for Credit Loss	(17)		(10)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	304		795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,141)		(908)
Available for sale, Fair Value	42,466		40,356
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	50,414		48,806
Debt Securities, Available-for-sale, Allowance for Credit Loss	(36)		(42)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	83		734
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(3,319)		(1,612)
Available for sale, Fair Value	47,142		47,886
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	35,635		31,533
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11		398
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,837)		(1,207)
Available for sale, Fair Value	$ 32,809		$ 30,724