Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Nine months or greater, but less than twelve months	$ 74,949	$ 16,570
Fair Value - Twelve months or greater	5,535	1,781
Fair Value - Total	80,484	18,351
Gross Unrealized Losses - Nine months or greater, but less than twelve months	12,219	308
Gross Unrealized Losses - Twelve months or greater	1,584	119
Gross Unrealized Losses - Total	$ 13,803	$ 427
Number of Securities - Total | security	8,051	2,577
Fair Value Decline, Greater Than 20% [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less than six months	$ 18,195	$ 12
Fair Value - Six months or greater, but less than nine months	394
Fair Value - Nine months or greater, but less than twelve months	1
Fair Value - Twelve months or greater	1	58
Fair Value - Total	18,591	70
Gross Unrealized Losses - Less than six months	6,892	3
Gross Unrealized Losses - Six months or greater, but less than nine months	266
Gross Unrealized Losses - Twelve months or greater		8
Gross Unrealized Losses - Total	$ 7,158	$ 11
Number of Securities - Less than six months | security	2,149	6
Number of Securities - Six months or greater, but less than nine months | security	78
Number of Securities - Nine months or greater, but less than twelve months | security	2
Number of Securities - Twelve months or greater | security	13	24
Number of Securities - Total | security	2,242	30