Variable Annuity and Insurance Guarantees (IUL Secondary Guarantees) (Details 2) (UL Secondary Guarantees [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
UL Secondary Guarantees [Member]
Net Amount at Risk by Product and Guarantee
Net amount at risk	$ 6,162	$ 6,076
Weighted average attained age	63 years	62 years

Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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)(5))

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

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Data Type:	xbrli:durationItemType
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Period Type:	duration