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Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 4,851	$ 3,517	$ 9,386	$ 7,942
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,249	1,037	2,453	2,166
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	333	282	660	579
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,029	1,639	3,968	3,460
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,247	1,199	2,500	2,424
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	45	52	84	90
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(53)	(694)	(281)	(770)
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1	$ 2	$ 2	$ (7)

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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