Guaranteed Benefit Features (Summary Of Guaranteed Death Benefit Liabilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Guaranteed Benefit Features [Abstract]
Balance as of beginning-of-year	$ 89	$ 73
Changes in reserves	6	8
Benefits paid	(6)	(4)
Balance as of end-of-period	$ 89	$ 77

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Amount of guaranteed minimum benefit payments to policyholders and contract holders, during the period presented, resulting in a decrease to the liability for expected guaranteed minimum benefits in excess of projected account values.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 55

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 80

-Section 50

-Paragraph 1

-Subparagraph (d)(4)

-URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473

+ Details

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Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 55

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 80

-Section 50

-Paragraph 1

-Subparagraph (d)(3)

-URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473

+ Details

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- Definition

Amount of guaranteed minimum benefit expense incurred for expected guaranteed minimum benefits in excess of projected account values.

+ References

+ Details

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