Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule of Investments [Line Items]
Balance as of beginning-of-year	$ 95	$ 203
Additions (reductions) from provision for credit loss expense	(18)	(20)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	77	183
Financing Receivable, Credit Loss, Expense (Reversal)	(18)	20
Loss on disposal of mortgage loans on real estate		4
Accrued investment income excluded from credit losses	49	50
Commercial [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	78	186
Additions (reductions) from provision for credit loss expense	(19)	(15)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	59	171
Residential [Member]
Schedule of Investments [Line Items]
Balance as of beginning-of-year	17	17
Additions (reductions) from provision for credit loss expense	1	(5)
Additions from purchases of PCD mortgage loans on real estate
Balance as of end-of-year	$ 18	$ 12