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Goodwill and Specifically Identifiable Intangible Assets (Changes In Carrying Amount Of Goodwill, By Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill Gross		$ 3,522	$ 3,522
Accumulated impairment as of beginning-of-year		(2,154)	(1,249)
Acquisition accounting adjustments	$ 414
Impairment		(905)
Net goodwill as of end-of-year	1,782	1,368
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)	(649)
Impairment		(905)
Net goodwill as of end-of-year	634	634
Group Protection Segment [Member]
Goodwill [Roll Forward]
Goodwill Gross		274	$ 274
Acquisition accounting adjustments	414
Impairment
Net goodwill as of end-of-year	$ 688	$ 274

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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