Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Investments [Line Items]
Balance as of beginning-of-year	$ 103	$ 77	$ 98	$ 95
Additions (reductions) from provision for credit loss expense	1	4	6	(14)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	104	81	104	81
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	4	15	5
Accrued investment income excluded from credit losses	53	49	53	49
Unfunded Loan Commitment [Member]
Schedule of Investments [Line Items]
Financing Receivable, Credit Loss, Expense (Reversal)	(2)	(1)	(1)	(1)
Commercial [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	83	59	83	78
Additions (reductions) from provision for credit loss expense	(2)	13	(2)	(6)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	81	72	81	72
Residential [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	20	18	15	17
Additions (reductions) from provision for credit loss expense	3	(9)	8	(8)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	$ 23	$ 9	$ 23	$ 9