Goodwill and Specifically Identifiable Intangible Assets (Changes In Carrying Amount Of Goodwill, By Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill Gross		$ 3,932	$ 3,936
Accumulated impairment as of beginning-of-year		(2,154)	(2,154)
Acquisition accounting adjustments		(4)
Impairment
Net goodwill as of end-of-year	1,778	1,778
Annuities Segment [Member]
Goodwill [Roll Forward]
Goodwill Gross		1,040	1,040
Accumulated impairment as of beginning-of-year		(600)	(600)
Impairment
Net goodwill as of end-of-year	440	440
Retirement Plan Services Segment [Member]
Goodwill [Roll Forward]
Goodwill Gross		20	20
Impairment
Net goodwill as of end-of-year	20	20
Life Insurance Segment [Member]
Goodwill [Roll Forward]
Goodwill Gross		2,188	2,188
Accumulated impairment as of beginning-of-year		(1,554)	(1,554)
Impairment
Net goodwill as of end-of-year	634	634
Group Protection Segment [Member]
Goodwill [Roll Forward]
Goodwill Gross		684	$ 688
Acquisition accounting adjustments		(4)
Impairment
Net goodwill as of end-of-year	$ 684	$ 684