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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 129,028		$ 124,726
Debt Securities, Available-for-sale, Allowance for Credit Loss	(48)	$ (50)	(52)	$ (71)	$ (63)	$ (70)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,081		1,954
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(4,543)		(3,948)
Available for sale, Fair Value	125,518		122,680
U.S. and local government securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,823		3,908
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	12		27
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(241)		(221)
Available for sale, Fair Value	3,594		3,714
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	42,094		40,479
Debt Securities, Available-for-sale, Allowance for Credit Loss	(14)		(10)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	477		795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,185)		(908)
Available for sale, Fair Value	41,372		40,356
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	49,363		48,806
Debt Securities, Available-for-sale, Allowance for Credit Loss	(34)		(42)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	375		734
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,777)		(1,612)
Available for sale, Fair Value	47,927		47,886
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	33,748		31,533
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	217		398
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,340)		(1,207)
Available for sale, Fair Value	$ 32,625		$ 30,724