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
Balance as of beginning-of-year	$ 105	$ 81	$ 99	$ 96
Additions (reductions) from provision for credit loss expense	8	10	14	(5)
Balance as of end-of-year	113	91	113	91
Accrued interest receivable excluded from credit losses	54	50	54	50
Unfunded Loan Commitment [Member]
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	1	(2)	(1)
Commercial [Member]
Balance as of beginning-of-year	82	72	84	79
Additions (reductions) from provision for credit loss expense	7	8	5	1
Balance as of end-of-year	89	80	89	80
Residential [Member]
Balance as of beginning-of-year	23	9	15	17
Additions (reductions) from provision for credit loss expense	1	2	9	(6)
Balance as of end-of-year	$ 24	$ 11	$ 24	$ 11