Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Investments [Line Items]
Balance as of beginning-of-year	$ 104	$ 81	$ 98	$ 95
Additions (reductions) from provision for credit loss expense	9	10	15	(4)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	113	91	113	91
Financing Receivable, Credit Loss, Expense (Reversal)	1	5	16	11
Accrued investment income excluded from credit losses	54	50	54	50
Unfunded Loan Commitment [Member]
Schedule of Investments [Line Items]
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	1	(1)	1
Commercial [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	81	72	83	78
Additions (reductions) from provision for credit loss expense	8	8	6	2
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	89	80	89	80
Residential [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	23	9	15	17
Additions (reductions) from provision for credit loss expense	1	2	9	(6)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	$ 24	$ 11	$ 24	$ 11