Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance as of beginning-of-year	$ 204,000,000
Balance as of end-of-year	96,000,000	$ 204,000,000
Changes in economic assumptions increasing provision	108,000,000
Accrued interest receivable excluded from credit losses	49,000,000	49,000,000
Financing Receivable, Credit Loss, Expense (Reversal)	(112,000,000)	117,000,000	$ 1,000,000
Unfunded Loan Commitment [Member]
Balance as of beginning-of-year	204,000,000	2,000,000
Additions (reductions) from provision for credit loss expense	(108,000,000)	114,000,000
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized	4,000,000
Balance as of end-of-year	96,000,000	204,000,000	2,000,000
Unfunded Loan Commitment [Member] | Covid 19 [Member]
Financing Receivable, Credit Loss, Expense (Reversal)	114,000,000	(2,000,000)
Commercial [Member]
Balance as of beginning-of-year	187,000,000
Balance as of end-of-year	79,000,000	187,000,000
Commercial [Member] | Unfunded Loan Commitment [Member]
Balance as of beginning-of-year	187,000,000
Additions (reductions) from provision for credit loss expense	(108,000,000)	125,000,000
Balance as of end-of-year	79,000,000	187,000,000
Residential [Member]
Balance as of beginning-of-year	17,000,000
Balance as of end-of-year	17,000,000	17,000,000
Residential [Member] | Unfunded Loan Commitment [Member]
Balance as of beginning-of-year	17,000,000	2,000,000
Additions (reductions) from provision for credit loss expense		(11,000,000)
Balance as of end-of-year	$ 17,000,000	17,000,000	2,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member]
Balance as of beginning-of-year		88,000,000
Balance as of end-of-year			88,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | Unfunded Loan Commitment [Member]
Balance as of beginning-of-year		62,000,000
Balance as of end-of-year			62,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member] | Unfunded Loan Commitment [Member]
Balance as of beginning-of-year		$ 26,000,000
Balance as of end-of-year			$ 26,000,000