Investments Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	$ 90,493	$ 85,188
Debt Securities, Available-for-sale, Allowance for Credit Loss	(14)	(20)	$ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,220	5,655
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(591)	(124)
Available for sale, Fair Value	93,108	90,699
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	2,111	2,471
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	109	199
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(6)	0
Available for sale, Fair Value	2,214	2,670
Foreign
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	25,156	24,594
Debt Securities, Available-for-sale, Allowance for Credit Loss	(8)	(6)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	953	1,808
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(272)	(42)
Available for sale, Fair Value	25,829	26,354
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	37,844	34,095
Debt Securities, Available-for-sale, Allowance for Credit Loss	(6)	(14)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,410	2,322
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(185)	(72)
Available for sale, Fair Value	39,063	36,331
Collateralized Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	20,080	17,456
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	532	1,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(123)	(8)
Available for sale, Fair Value	20,489	18,470
States, municipalities, and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturities available for sale, at amortized cost	5,302	6,572
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	216	304
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(5)	(2)
Available for sale, Fair Value	$ 5,513	$ 6,874

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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