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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Details) - Fixed Maturities [Member] - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 29,277	$ 57,189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,024)	(4,115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	38,985	14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,099)	(2,291)
Debt Securities, Available-for-sale, Unrealized Loss Position	68,262	72,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(5,123)	(6,406)
U.S. Treasury / Agency
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,564	2,152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(39)	(125)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	912	386
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(88)	(46)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,476	2,538
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(127)	(171)
Non-U.S.
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7,195	15,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(243)	(1,012)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	11,689	5,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,004)	(704)
Debt Securities, Available-for-sale, Unrealized Loss Position	18,884	21,028
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,247)	(1,716)
Corporate and asset-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	13,577	25,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(507)	(1,793)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,222	4,190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,356)	(552)
Debt Securities, Available-for-sale, Unrealized Loss Position	28,799	29,877
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,863)	(2,345)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,769	10,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(205)	(1,033)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,427	4,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,528)	(941)
Debt Securities, Available-for-sale, Unrealized Loss Position	15,196	15,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,733)	(1,974)
Municipal
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,172	3,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(30)	(152)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	735	155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(123)	(48)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,907	3,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (153)	$ (200)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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