Investmenst (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Balance as of beginning-of-year	$ 203	$ 2
Additions (reductions) from provision for credit loss expense	(108)	114
Balance as of end-of-year	95	203
Changes in economic assumptions increasing provision	108
Accrued interest receivable excluded from credit losses	48	48
Covid Pandemic [Member]
Schedule of Investments [Line Items]
Additions (reductions) from provision for credit loss expense		(114)
Unfunded Loan Commitment [Member]
Schedule of Investments [Line Items]
Additions (reductions) from provision for credit loss expense	3
Commercial [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	186
Additions (reductions) from provision for credit loss expense	(108)	125
Balance as of end-of-year	78	186
Residential [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	17	2
Additions (reductions) from provision for credit loss expense		(11)
Balance as of end-of-year	$ 17	17
Mortgage Loans [Member] | Unfunded Loan Commitment [Member]
Schedule of Investments [Line Items]
Additions (reductions) from provision for credit loss expense		2
Cumulative Effect, Period of Adoption, Adjustment [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year		87
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year		61
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year		$ 26