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Guaranteed Benefit Features (Summary Of Guaranteed Death Benefit Liabilities) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Guaranteed Benefit Features [Abstract]
Balance as of beginning-of-year	$ 121	$ 117
Changes in reserves	14	35
Benefits paid	(11)	(17)
Balance as of end-of-period	$ 124	$ 135

X

- Definition

Guaranteed Benefit Features [Abstract]

+ References

No definition available.

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- Definition

Liabilities for Guarantees on Long-Duration Contracts, Increase (decrease) in reserves

+ References

No definition available.

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- Definition

Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121639652&loc=d3e7104-158389

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=121641442&loc=d3e19393-158473

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- Definition

Amount of cash outflow to policyholders and contract holders for guaranteed minimum benefit payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=121639652&loc=d3e7104-158389

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121641442&loc=d3e19393-158473

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