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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 88,265		$ 85,188
Debt Securities, Available-for-sale, Allowance for Credit Loss	(11)	$ (15)	(20)	$ (69)	$ (176)	$ 0
Available for Sale, Gross Unrealized Appreciation	4,228		5,655
Available for Sale, Gross Unrealized Depreciation	(319)		(124)
Available for sale, Fair Value	92,163		90,699
U.S. Treasury / Agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,349		2,471
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available for Sale, Gross Unrealized Appreciation	134		199
Available for Sale, Gross Unrealized Depreciation	(5)		0
Available for sale, Fair Value	2,478		2,670
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25,269		24,594
Debt Securities, Available-for-sale, Allowance for Credit Loss	(5)		(6)
Available for Sale, Gross Unrealized Appreciation	1,296		1,808
Available for Sale, Gross Unrealized Depreciation	(148)		(42)
Available for sale, Fair Value	26,412		26,354
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	35,916		34,095
Debt Securities, Available-for-sale, Allowance for Credit Loss	(6)		(14)
Available for Sale, Gross Unrealized Appreciation	1,779		2,322
Available for Sale, Gross Unrealized Depreciation	(114)		(72)
Available for sale, Fair Value	37,575		36,331
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	18,851		17,456
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available for Sale, Gross Unrealized Appreciation	752		1,022
Available for Sale, Gross Unrealized Depreciation	(50)		(8)
Available for sale, Fair Value	19,553		18,470
Municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,880		6,572
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available for Sale, Gross Unrealized Appreciation	267		304
Available for Sale, Gross Unrealized Depreciation	(2)		(2)
Available for sale, Fair Value	$ 6,145		$ 6,874

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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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