Goodwill and Specifically Identifiable Intangible Assets (Schedule Of Intangible Assets By Reportable Segment) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount		$ 715	$ 715
Accumulated amortization		82	56
Retirement Plan Services Segment [Member] | Mutual Fund Contract Rights [Member]
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount	[1]	5	5
Life Insurance Segment [Member] | Sales Force [Member]
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount		100	100
Accumulated amortization		55	51
Group Protection Segment [Member] | Insurance Licenses [Member]
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount	[1]	3	3
Group Protection Segment [Member] | VOCRA [Member]
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount		576	576
Accumulated amortization		25	5
Group Protection Segment [Member] | VODA [Member]
Finite And Indefinife Lived Intangible Assets Net [Abstract]
Gross carrying amount		31	$ 31
Accumulated amortization		$ 2

[1] No amortization recorded as the intangible asset has indefinite life.