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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Holding Company [Member] | Level 3 [Member]
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 13
Investment Segment [Member]
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Option, Changes in Instrument Specific Credit Risk, Effect of One Percent Decrease to Risk Premium on Fair Value in Percentage of Change	2.00%
Fair Value, Option, Changes in Instrument Specific Credit Risk, Effect of One Percent Increase to Risk Premium on Fair Value in Percentage of Change	0.00%
Investment Segment [Member] | Level 3 [Member]
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(4)	(8)
Unrealized losses included in earnings related to Level 3 investments	$ 4

X

- Definition

Fair Value, Option, Changes in Instrument Specific Credit Risk, Effect of One Percent Decrease to Risk Premium on Fair Value in Percentage of Change

+ References

No definition available.

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- Definition

Fair Value, Option, Changes in Instrument Specific Credit Risk, Effect of One Percent Increase to Risk Premium on Fair Value in Percentage of Change

+ References

No definition available.

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X

- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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X

- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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