Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Balance as of beginning-of-year	$ 99,000,000	$ 96,000,000
Additions (reductions) from provision for credit loss expense	4,000,000	(19,000,000)
Balance as of end-of-year	103,000,000	77,000,000
Accrued interest receivable excluded from credit losses	52,000,000	49,000,000
Unfunded Loan Commitment [Member]
Financing Receivable, Credit Loss, Expense (Reversal)	0	1,000,000
Commercial [Member]
Balance as of beginning-of-year	84,000,000	79,000,000
Additions (reductions) from provision for credit loss expense	(1,000,000)	(20,000,000)
Balance as of end-of-year	83,000,000	59,000,000
Residential [Member]
Balance as of beginning-of-year	15,000,000	17,000,000
Additions (reductions) from provision for credit loss expense	5,000,000	1,000,000
Balance as of end-of-year	$ 20,000,000	$ 18,000,000